syzbot has found a reproducer for the following issue on: HEAD commit: b983b271662b misc: sgi-gru: Don't disable preemption in GR.. git tree: upstream console+strace: https://syzkaller.appspot.com/x/log.txt?x=14874b27980000 kernel config: https://syzkaller.appspot.com/x/.config?x=fb6ea01107fa96bd dashboard link: https://syzkaller.appspot.com/bug?extid=c391aebb8e8e8cd95c55 compiler: gcc (Debian 12.2.0-14) 12.2.0, GNU ld (GNU Binutils for Debian) 2.40 syz repro: https://syzkaller.appspot.com/x/repro.syz?x=118c6fd0580000 C reproducer: https://syzkaller.appspot.com/x/repro.c?x=16b6a040580000 Downloadable assets: disk image: https://storage.googleapis.com/syzbot-assets/26adc3db9854/disk-b983b271.raw.xz vmlinux: https://storage.googleapis.com/syzbot-assets/957da8fb32ba/vmlinux-b983b271.xz kernel image: https://storage.googleapis.com/syzbot-assets/81f66240a49a/bzImage-b983b271.xz IMPORTANT: if you fix the issue, please add the following tag to the commit: Reported-by: syzbot+c391aebb8e8e8cd95c55@xxxxxxxxxxxxxxxxxxxxxxxxx INFO: task syz-executor966:9384 blocked for more than 143 seconds. Not tainted 6.12.0-rc2-syzkaller-00061-gb983b271662b #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. task:syz-executor966 state:D stack:26992 pid:9384 tgid:9380 ppid:5243 flags:0x00004006 Call Trace: <TASK> context_switch kernel/sched/core.c:5322 [inline] __schedule+0xef5/0x5750 kernel/sched/core.c:6682 __schedule_loop kernel/sched/core.c:6759 [inline] schedule+0xe7/0x350 kernel/sched/core.c:6774 schedule_preempt_disabled+0x13/0x30 kernel/sched/core.c:6831 __mutex_lock_common kernel/locking/mutex.c:684 [inline] __mutex_lock+0x5b8/0x9c0 kernel/locking/mutex.c:752 hugetlb_wp+0x1b4a/0x3320 mm/hugetlb.c:5894 hugetlb_fault+0x2248/0x2fa0 mm/hugetlb.c:6454 handle_mm_fault+0x930/0xaa0 mm/memory.c:6060 do_user_addr_fault+0x7a3/0x13f0 arch/x86/mm/fault.c:1389 handle_page_fault arch/x86/mm/fault.c:1481 [inline] exc_page_fault+0x5c/0xc0 arch/x86/mm/fault.c:1539 asm_exc_page_fault+0x26/0x30 arch/x86/include/asm/idtentry.h:623 RIP: 0010:rep_movs_alternative+0x33/0x70 arch/x86/lib/copy_user_64.S:58 Code: 40 83 f9 08 73 21 85 c9 74 0f 8a 06 88 07 48 ff c7 48 ff c6 48 ff c9 75 f1 c3 cc cc cc cc 66 0f 1f 84 00 00 00 00 00 48 8b 06 <48> 89 07 48 83 c6 08 48 83 c7 08 83 e9 08 74 df 83 f9 08 73 e8 eb RSP: 0018:ffffc9000ca47c48 EFLAGS: 00050246 RAX: 0000000000000000 RBX: 0000000000000008 RCX: 0000000000000008 RDX: fffff52001948f98 RSI: ffffc9000ca47cb8 RDI: 000000002002d008 RBP: 000000002002d008 R08: 0000000000000000 R09: fffff52001948f97 R10: ffffc9000ca47cbf R11: 0000000000000000 R12: ffffc9000ca47cb8 R13: 000000002002d010 R14: 0000000000000000 R15: 0000000020019680 copy_user_generic arch/x86/include/asm/uaccess_64.h:121 [inline] raw_copy_to_user arch/x86/include/asm/uaccess_64.h:142 [inline] _inline_copy_to_user include/linux/uaccess.h:188 [inline] _copy_to_user+0xac/0xc0 lib/usercopy.c:26 copy_to_user include/linux/uaccess.h:216 [inline] msr_read+0x14f/0x250 arch/x86/kernel/msr.c:69 vfs_read+0x1ce/0xbd0 fs/read_write.c:567 ksys_read+0x12f/0x260 fs/read_write.c:712 do_syscall_x64 arch/x86/entry/common.c:52 [inline] do_syscall_64+0xcd/0x250 arch/x86/entry/common.c:83 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7f1ba3b462d9 RSP: 002b:00007f1ba3afe218 EFLAGS: 00000246 ORIG_RAX: 0000000000000000 RAX: ffffffffffffffda RBX: 00007f1ba3bcd328 RCX: 00007f1ba3b462d9 RDX: 0000000000018ff8 RSI: 0000000020019680 RDI: 0000000000000003 RBP: 00007f1ba3bcd320 R08: 0000000000000000 R09: 0000000000000000 R10: 0072736d2f232f75 R11: 0000000000000246 R12: 00007f1ba3b9a328 R13: 00007f1ba3b9a078 R14: 0072736d2f232f75 R15: 7570632f7665642f </TASK> INFO: task syz-executor966:9388 blocked for more than 143 seconds. Not tainted 6.12.0-rc2-syzkaller-00061-gb983b271662b #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. task:syz-executor966 state:D stack:27104 pid:9388 tgid:9380 ppid:5243 flags:0x00000006 Call Trace: <TASK> context_switch kernel/sched/core.c:5322 [inline] __schedule+0xef5/0x5750 kernel/sched/core.c:6682 __schedule_loop kernel/sched/core.c:6759 [inline] schedule+0xe7/0x350 kernel/sched/core.c:6774 io_schedule+0xbf/0x130 kernel/sched/core.c:7559 folio_wait_bit_common+0x3d8/0x9b0 mm/filemap.c:1309 __folio_lock mm/filemap.c:1647 [inline] folio_lock include/linux/pagemap.h:1148 [inline] folio_lock include/linux/pagemap.h:1144 [inline] __filemap_get_folio+0x6a4/0xaf0 mm/filemap.c:1900 filemap_lock_folio include/linux/pagemap.h:788 [inline] filemap_lock_hugetlb_folio include/linux/hugetlb.h:795 [inline] hugetlb_fault+0x16ff/0x2fa0 mm/hugetlb.c:6406 handle_mm_fault+0x930/0xaa0 mm/memory.c:6060 do_user_addr_fault+0x60d/0x13f0 arch/x86/mm/fault.c:1338 handle_page_fault arch/x86/mm/fault.c:1481 [inline] exc_page_fault+0x5c/0xc0 arch/x86/mm/fault.c:1539 asm_exc_page_fault+0x26/0x30 arch/x86/include/asm/idtentry.h:623 RIP: 0033:0x7f1ba3b0f030 RSP: 002b:00007f1ba3add220 EFLAGS: 00010217 RAX: 00007f1ba3b0f030 RBX: 00007f1ba3bcd338 RCX: ffffffffffffffb0 RDX: 0000000000000000 RSI: 0000000000000080 RDI: 00007f1ba3bcd338 RBP: 00007f1ba3bcd330 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 00007f1ba3b9a328 R13: 00007f1ba3b9a078 R14: 0072736d2f232f75 R15: 7570632f7665642f </TASK> INFO: task syz-executor966:9434 blocked for more than 143 seconds. Not tainted 6.12.0-rc2-syzkaller-00061-gb983b271662b #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. task:syz-executor966 state:D stack:27728 pid:9434 tgid:9430 ppid:5238 flags:0x00004006 Call Trace: <TASK> context_switch kernel/sched/core.c:5322 [inline] __schedule+0xef5/0x5750 kernel/sched/core.c:6682 __schedule_loop kernel/sched/core.c:6759 [inline] schedule+0xe7/0x350 kernel/sched/core.c:6774 schedule_preempt_disabled+0x13/0x30 kernel/sched/core.c:6831 __mutex_lock_common kernel/locking/mutex.c:684 [inline] __mutex_lock+0x5b8/0x9c0 kernel/locking/mutex.c:752 hugetlb_fault+0x307/0x2fa0 mm/hugetlb.c:6326 handle_mm_fault+0x930/0xaa0 mm/memory.c:6060 do_user_addr_fault+0x7a3/0x13f0 arch/x86/mm/fault.c:1389 handle_page_fault arch/x86/mm/fault.c:1481 [inline] exc_page_fault+0x5c/0xc0 arch/x86/mm/fault.c:1539 asm_exc_page_fault+0x26/0x30 arch/x86/include/asm/idtentry.h:623 RIP: 0010:rep_movs_alternative+0x33/0x70 arch/x86/lib/copy_user_64.S:58 Code: 40 83 f9 08 73 21 85 c9 74 0f 8a 06 88 07 48 ff c7 48 ff c6 48 ff c9 75 f1 c3 cc cc cc cc 66 0f 1f 84 00 00 00 00 00 48 8b 06 <48> 89 07 48 83 c6 08 48 83 c7 08 83 e9 08 74 df 83 f9 08 73 e8 eb RSP: 0018:ffffc9000cde7c48 EFLAGS: 00050246 RAX: 0000000000000000 RBX: 0000000000000008 RCX: 0000000000000008 RDX: fffff520019bcf98 RSI: ffffc9000cde7cb8 RDI: 000000002001d448 RBP: 000000002001d448 R08: 0000000000000000 R09: fffff520019bcf97 R10: ffffc9000cde7cbf R11: 0000000000000000 R12: ffffc9000cde7cb8 R13: 000000002001d450 R14: 0000000000000000 R15: 0000000020019680 copy_user_generic arch/x86/include/asm/uaccess_64.h:121 [inline] raw_copy_to_user arch/x86/include/asm/uaccess_64.h:142 [inline] _inline_copy_to_user include/linux/uaccess.h:188 [inline] _copy_to_user+0xac/0xc0 lib/usercopy.c:26 copy_to_user include/linux/uaccess.h:216 [inline] msr_read+0x14f/0x250 arch/x86/kernel/msr.c:69 vfs_read+0x1ce/0xbd0 fs/read_write.c:567 ksys_read+0x12f/0x260 fs/read_write.c:712 do_syscall_x64 arch/x86/entry/common.c:52 [inline] do_syscall_64+0xcd/0x250 arch/x86/entry/common.c:83 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7f1ba3b462d9 RSP: 002b:00007f1ba3afe218 EFLAGS: 00000246 ORIG_RAX: 0000000000000000 RAX: ffffffffffffffda RBX: 00007f1ba3bcd328 RCX: 00007f1ba3b462d9 RDX: 0000000000018ff8 RSI: 0000000020019680 RDI: 0000000000000003 RBP: 00007f1ba3bcd320 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 00007f1ba3b9a328 R13: 00007f1ba3b9a078 R14: 0072736d2f232f75 R15: 7570632f7665642f </TASK> INFO: task syz-executor966:9437 blocked for more than 144 seconds. Not tainted 6.12.0-rc2-syzkaller-00061-gb983b271662b #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. task:syz-executor966 state:D stack:27408 pid:9437 tgid:9430 ppid:5238 flags:0x00004006 Call Trace: <TASK> context_switch kernel/sched/core.c:5322 [inline] __schedule+0xef5/0x5750 kernel/sched/core.c:6682 __schedule_loop kernel/sched/core.c:6759 [inline] schedule+0xe7/0x350 kernel/sched/core.c:6774 schedule_preempt_disabled+0x13/0x30 kernel/sched/core.c:6831 __mutex_lock_common kernel/locking/mutex.c:684 [inline] __mutex_lock+0x5b8/0x9c0 kernel/locking/mutex.c:752 hugetlbfs_fallocate+0x577/0xfc0 fs/hugetlbfs/inode.c:872 vfs_fallocate+0x459/0xf90 fs/open.c:333 ksys_fallocate fs/open.c:356 [inline] __do_sys_fallocate fs/open.c:364 [inline] __se_sys_fallocate fs/open.c:362 [inline] __x64_sys_fallocate+0xd9/0x150 fs/open.c:362 do_syscall_x64 arch/x86/entry/common.c:52 [inline] do_syscall_64+0xcd/0x250 arch/x86/entry/common.c:83 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7f1ba3b462d9 RSP: 002b:00007f1ba3add218 EFLAGS: 00000246 ORIG_RAX: 000000000000011d RAX: ffffffffffffffda RBX: 00007f1ba3bcd338 RCX: 00007f1ba3b462d9 RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000004 RBP: 00007f1ba3bcd330 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000400 R11: 0000000000000246 R12: 00007f1ba3b9a328 R13: 00007f1ba3b9a078 R14: 0072736d2f232f75 R15: 7570632f7665642f </TASK> INFO: task syz-executor966:9679 blocked for more than 144 seconds. Not tainted 6.12.0-rc2-syzkaller-00061-gb983b271662b #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. task:syz-executor966 state:D stack:28288 pid:9679 tgid:9678 ppid:5241 flags:0x00004006 Call Trace: <TASK> context_switch kernel/sched/core.c:5322 [inline] __schedule+0xef5/0x5750 kernel/sched/core.c:6682 __schedule_loop kernel/sched/core.c:6759 [inline] schedule+0xe7/0x350 kernel/sched/core.c:6774 schedule_preempt_disabled+0x13/0x30 kernel/sched/core.c:6831 __mutex_lock_common kernel/locking/mutex.c:684 [inline] __mutex_lock+0x5b8/0x9c0 kernel/locking/mutex.c:752 hugetlb_fault+0x307/0x2fa0 mm/hugetlb.c:6326 handle_mm_fault+0x930/0xaa0 mm/memory.c:6060 do_user_addr_fault+0x7a3/0x13f0 arch/x86/mm/fault.c:1389 handle_page_fault arch/x86/mm/fault.c:1481 [inline] exc_page_fault+0x5c/0xc0 arch/x86/mm/fault.c:1539 asm_exc_page_fault+0x26/0x30 arch/x86/include/asm/idtentry.h:623 RIP: 0010:rep_movs_alternative+0x33/0x70 arch/x86/lib/copy_user_64.S:58 Code: 40 83 f9 08 73 21 85 c9 74 0f 8a 06 88 07 48 ff c7 48 ff c6 48 ff c9 75 f1 c3 cc cc cc cc 66 0f 1f 84 00 00 00 00 00 48 8b 06 <48> 89 07 48 83 c6 08 48 83 c7 08 83 e9 08 74 df 83 f9 08 73 e8 eb RSP: 0018:ffffc9000d2b7c48 EFLAGS: 00050246 RAX: 0000000000000000 RBX: 0000000000000008 RCX: 0000000000000008 RDX: fffff52001a56f98 RSI: ffffc9000d2b7cb8 RDI: 0000000020020f20 RBP: 0000000020020f20 R08: 0000000000000000 R09: fffff52001a56f97 R10: ffffc9000d2b7cbf R11: 0000000000000000 R12: ffffc9000d2b7cb8 R13: 0000000020020f28 R14: 0000000000000000 R15: 0000000020019680 copy_user_generic arch/x86/include/asm/uaccess_64.h:121 [inline] raw_copy_to_user arch/x86/include/asm/uaccess_64.h:142 [inline] _inline_copy_to_user include/linux/uaccess.h:188 [inline] _copy_to_user+0xac/0xc0 lib/usercopy.c:26 copy_to_user include/linux/uaccess.h:216 [inline] msr_read+0x14f/0x250 arch/x86/kernel/msr.c:69 vfs_read+0x1ce/0xbd0 fs/read_write.c:567 ksys_read+0x12f/0x260 fs/read_write.c:712 do_syscall_x64 arch/x86/entry/common.c:52 [inline] do_syscall_64+0xcd/0x250 arch/x86/entry/common.c:83 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7f1ba3b462d9 RSP: 002b:00007f1ba3afe218 EFLAGS: 00000246 ORIG_RAX: 0000000000000000 RAX: ffffffffffffffda RBX: 00007f1ba3bcd328 RCX: 00007f1ba3b462d9 RDX: 0000000000018ff8 RSI: 0000000020019680 RDI: 0000000000000003 RBP: 00007f1ba3bcd320 R08: 0000000000000000 R09: 0000000000000000 R10: 0072736d2f232f75 R11: 0000000000000246 R12: 00007f1ba3b9a328 R13: 00007f1ba3b9a078 R14: 0072736d2f232f75 R15: 7570632f7665642f </TASK> INFO: task syz-executor966:9684 blocked for more than 144 seconds. Not tainted 6.12.0-rc2-syzkaller-00061-gb983b271662b #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. task:syz-executor966 state:D stack:27408 pid:9684 tgid:9678 ppid:5241 flags:0x00004006 Call Trace: <TASK> context_switch kernel/sched/core.c:5322 [inline] __schedule+0xef5/0x5750 kernel/sched/core.c:6682 __schedule_loop kernel/sched/core.c:6759 [inline] schedule+0xe7/0x350 kernel/sched/core.c:6774 schedule_preempt_disabled+0x13/0x30 kernel/sched/core.c:6831 __mutex_lock_common kernel/locking/mutex.c:684 [inline] __mutex_lock+0x5b8/0x9c0 kernel/locking/mutex.c:752 hugetlbfs_fallocate+0x577/0xfc0 fs/hugetlbfs/inode.c:872 vfs_fallocate+0x459/0xf90 fs/open.c:333 ksys_fallocate fs/open.c:356 [inline] __do_sys_fallocate fs/open.c:364 [inline] __se_sys_fallocate fs/open.c:362 [inline] __x64_sys_fallocate+0xd9/0x150 fs/open.c:362 do_syscall_x64 arch/x86/entry/common.c:52 [inline] do_syscall_64+0xcd/0x250 arch/x86/entry/common.c:83 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7f1ba3b462d9 RSP: 002b:00007f1ba3add218 EFLAGS: 00000246 ORIG_RAX: 000000000000011d RAX: ffffffffffffffda RBX: 00007f1ba3bcd338 RCX: 00007f1ba3b462d9 RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000004 RBP: 00007f1ba3bcd330 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000400 R11: 0000000000000246 R12: 00007f1ba3b9a328 R13: 00007f1ba3b9a078 R14: 0072736d2f232f75 R15: 7570632f7665642f </TASK> INFO: task syz-executor966:9733 blocked for more than 145 seconds. Not tainted 6.12.0-rc2-syzkaller-00061-gb983b271662b #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. task:syz-executor966 state:D stack:28288 pid:9733 tgid:9731 ppid:5239 flags:0x00004006 Call Trace: <TASK> context_switch kernel/sched/core.c:5322 [inline] __schedule+0xef5/0x5750 kernel/sched/core.c:6682 __schedule_loop kernel/sched/core.c:6759 [inline] schedule+0xe7/0x350 kernel/sched/core.c:6774 schedule_preempt_disabled+0x13/0x30 kernel/sched/core.c:6831 __mutex_lock_common kernel/locking/mutex.c:684 [inline] __mutex_lock+0x5b8/0x9c0 kernel/locking/mutex.c:752 hugetlb_fault+0x307/0x2fa0 mm/hugetlb.c:6326 handle_mm_fault+0x930/0xaa0 mm/memory.c:6060 do_user_addr_fault+0x7a3/0x13f0 arch/x86/mm/fault.c:1389 handle_page_fault arch/x86/mm/fault.c:1481 [inline] exc_page_fault+0x5c/0xc0 arch/x86/mm/fault.c:1539 asm_exc_page_fault+0x26/0x30 arch/x86/include/asm/idtentry.h:623 RIP: 0010:rep_movs_alternative+0x33/0x70 arch/x86/lib/copy_user_64.S:58 Code: 40 83 f9 08 73 21 85 c9 74 0f 8a 06 88 07 48 ff c7 48 ff c6 48 ff c9 75 f1 c3 cc cc cc cc 66 0f 1f 84 00 00 00 00 00 48 8b 06 <48> 89 07 48 83 c6 08 48 83 c7 08 83 e9 08 74 df 83 f9 08 73 e8 eb RSP: 0018:ffffc9000d2e7c48 EFLAGS: 00050246 RAX: 0000000000000000 RBX: 0000000000000008 RCX: 0000000000000008 RDX: fffff52001a5cf98 RSI: ffffc9000d2e7cb8 RDI: 0000000020023000 RBP: 0000000020023000 R08: 0000000000000000 R09: fffff52001a5cf97 R10: ffffc9000d2e7cbf R11: 0000000000000000 R12: ffffc9000d2e7cb8 R13: 0000000020023008 R14: 0000000000000000 R15: 0000000020019680 copy_user_generic arch/x86/include/asm/uaccess_64.h:121 [inline] raw_copy_to_user arch/x86/include/asm/uaccess_64.h:142 [inline] _inline_copy_to_user include/linux/uaccess.h:188 [inline] _copy_to_user+0xac/0xc0 lib/usercopy.c:26 copy_to_user include/linux/uaccess.h:216 [inline] msr_read+0x14f/0x250 arch/x86/kernel/msr.c:69 vfs_read+0x1ce/0xbd0 fs/read_write.c:567 ksys_read+0x12f/0x260 fs/read_write.c:712 do_syscall_x64 arch/x86/entry/common.c:52 [inline] do_syscall_64+0xcd/0x250 arch/x86/entry/common.c:83 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7f1ba3b462d9 RSP: 002b:00007f1ba3afe218 EFLAGS: 00000246 ORIG_RAX: 0000000000000000 RAX: ffffffffffffffda RBX: 00007f1ba3bcd328 RCX: 00007f1ba3b462d9 RDX: 0000000000018ff8 RSI: 0000000020019680 RDI: 0000000000000003 RBP: 00007f1ba3bcd320 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 00007f1ba3b9a328 R13: 00007f1ba3b9a078 R14: 0072736d2f232f75 R15: 7570632f7665642f </TASK> INFO: task syz-executor966:9735 blocked for more than 145 seconds. Not tainted 6.12.0-rc2-syzkaller-00061-gb983b271662b #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. task:syz-executor966 state:D stack:27408 pid:9735 tgid:9731 ppid:5239 flags:0x00004006 Call Trace: <TASK> context_switch kernel/sched/core.c:5322 [inline] __schedule+0xef5/0x5750 kernel/sched/core.c:6682 __schedule_loop kernel/sched/core.c:6759 [inline] schedule+0xe7/0x350 kernel/sched/core.c:6774 schedule_preempt_disabled+0x13/0x30 kernel/sched/core.c:6831 __mutex_lock_common kernel/locking/mutex.c:684 [inline] __mutex_lock+0x5b8/0x9c0 kernel/locking/mutex.c:752 hugetlbfs_fallocate+0x577/0xfc0 fs/hugetlbfs/inode.c:872 vfs_fallocate+0x459/0xf90 fs/open.c:333 ksys_fallocate fs/open.c:356 [inline] __do_sys_fallocate fs/open.c:364 [inline] __se_sys_fallocate fs/open.c:362 [inline] __x64_sys_fallocate+0xd9/0x150 fs/open.c:362 do_syscall_x64 arch/x86/entry/common.c:52 [inline] do_syscall_64+0xcd/0x250 arch/x86/entry/common.c:83 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7f1ba3b462d9 RSP: 002b:00007f1ba3add218 EFLAGS: 00000246 ORIG_RAX: 000000000000011d RAX: ffffffffffffffda RBX: 00007f1ba3bcd338 RCX: 00007f1ba3b462d9 RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000004 RBP: 00007f1ba3bcd330 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000400 R11: 0000000000000246 R12: 00007f1ba3b9a328 R13: 00007f1ba3b9a078 R14: 0072736d2f232f75 R15: 7570632f7665642f </TASK> INFO: task syz-executor966:9786 blocked for more than 145 seconds. Not tainted 6.12.0-rc2-syzkaller-00061-gb983b271662b #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. task:syz-executor966 state:D stack:27648 pid:9786 tgid:9785 ppid:5236 flags:0x00004006 Call Trace: <TASK> context_switch kernel/sched/core.c:5322 [inline] __schedule+0xef5/0x5750 kernel/sched/core.c:6682 __schedule_loop kernel/sched/core.c:6759 [inline] schedule+0xe7/0x350 kernel/sched/core.c:6774 schedule_preempt_disabled+0x13/0x30 kernel/sched/core.c:6831 __mutex_lock_common kernel/locking/mutex.c:684 [inline] __mutex_lock+0x5b8/0x9c0 kernel/locking/mutex.c:752 hugetlb_fault+0x307/0x2fa0 mm/hugetlb.c:6326 handle_mm_fault+0x930/0xaa0 mm/memory.c:6060 do_user_addr_fault+0x7a3/0x13f0 arch/x86/mm/fault.c:1389 handle_page_fault arch/x86/mm/fault.c:1481 [inline] exc_page_fault+0x5c/0xc0 arch/x86/mm/fault.c:1539 asm_exc_page_fault+0x26/0x30 arch/x86/include/asm/idtentry.h:623 RIP: 0010:rep_movs_alternative+0x33/0x70 arch/x86/lib/copy_user_64.S:58 Code: 40 83 f9 08 73 21 85 c9 74 0f 8a 06 88 07 48 ff c7 48 ff c6 48 ff c9 75 f1 c3 cc cc cc cc 66 0f 1f 84 00 00 00 00 00 48 8b 06 <48> 89 07 48 83 c6 08 48 83 c7 08 83 e9 08 74 df 83 f9 08 73 e8 eb RSP: 0018:ffffc9000d477c48 EFLAGS: 00050246 RAX: 0000000000000000 RBX: 0000000000000008 RCX: 0000000000000008 RDX: fffff52001a8ef98 RSI: ffffc9000d477cb8 RDI: 00000000200226e0 RBP: 00000000200226e0 R08: 0000000000000000 R09: fffff52001a8ef97 R10: ffffc9000d477cbf R11: 0000000000000000 R12: ffffc9000d477cb8 R13: 00000000200226e8 R14: 0000000000000000 R15: 0000000020019680 copy_user_generic arch/x86/include/asm/uaccess_64.h:121 [inline] raw_copy_to_user arch/x86/include/asm/uaccess_64.h:142 [inline] _inline_copy_to_user include/linux/uaccess.h:188 [inline] _copy_to_user+0xac/0xc0 lib/usercopy.c:26 copy_to_user include/linux/uaccess.h:216 [inline] msr_read+0x14f/0x250 arch/x86/kernel/msr.c:69 vfs_read+0x1ce/0xbd0 fs/read_write.c:567 ksys_read+0x12f/0x260 fs/read_write.c:712 do_syscall_x64 arch/x86/entry/common.c:52 [inline] do_syscall_64+0xcd/0x250 arch/x86/entry/common.c:83 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7f1ba3b462d9 RSP: 002b:00007f1ba3afe218 EFLAGS: 00000246 ORIG_RAX: 0000000000000000 RAX: ffffffffffffffda RBX: 00007f1ba3bcd328 RCX: 00007f1ba3b462d9 RDX: 0000000000018ff8 RSI: 0000000020019680 RDI: 0000000000000003 RBP: 00007f1ba3bcd320 R08: 0000000000000000 R09: 0000000000000000 R10: 0072736d2f232f75 R11: 0000000000000246 R12: 00007f1ba3b9a328 R13: 00007f1ba3b9a078 R14: 0072736d2f232f75 R15: 7570632f7665642f </TASK> INFO: task syz-executor966:9787 blocked for more than 146 seconds. Not tainted 6.12.0-rc2-syzkaller-00061-gb983b271662b #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. task:syz-executor966 state:D stack:27408 pid:9787 tgid:9785 ppid:5236 flags:0x00004006 Call Trace: <TASK> context_switch kernel/sched/core.c:5322 [inline] __schedule+0xef5/0x5750 kernel/sched/core.c:6682 __schedule_loop kernel/sched/core.c:6759 [inline] schedule+0xe7/0x350 kernel/sched/core.c:6774 schedule_preempt_disabled+0x13/0x30 kernel/sched/core.c:6831 __mutex_lock_common kernel/locking/mutex.c:684 [inline] __mutex_lock+0x5b8/0x9c0 kernel/locking/mutex.c:752 hugetlbfs_fallocate+0x577/0xfc0 fs/hugetlbfs/inode.c:872 vfs_fallocate+0x459/0xf90 fs/open.c:333 ksys_fallocate fs/open.c:356 [inline] __do_sys_fallocate fs/open.c:364 [inline] __se_sys_fallocate fs/open.c:362 [inline] __x64_sys_fallocate+0xd9/0x150 fs/open.c:362 do_syscall_x64 arch/x86/entry/common.c:52 [inline] do_syscall_64+0xcd/0x250 arch/x86/entry/common.c:83 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7f1ba3b462d9 RSP: 002b:00007f1ba3add218 EFLAGS: 00000246 ORIG_RAX: 000000000000011d RAX: ffffffffffffffda RBX: 00007f1ba3bcd338 RCX: 00007f1ba3b462d9 RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000004 RBP: 00007f1ba3bcd330 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000400 R11: 0000000000000246 R12: 00007f1ba3b9a328 R13: 00007f1ba3b9a078 R14: 0072736d2f232f75 R15: 7570632f7665642f </TASK> Future hung task reports are suppressed, see sysctl kernel.hung_task_warnings Showing all locks held in the system: 1 lock held by khungtaskd/30: #0: ffffffff8e1b8340 (rcu_read_lock){....}-{1:2}, at: rcu_lock_acquire include/linux/rcupdate.h:337 [inline] #0: ffffffff8e1b8340 (rcu_read_lock){....}-{1:2}, at: rcu_read_lock include/linux/rcupdate.h:849 [inline] #0: ffffffff8e1b8340 (rcu_read_lock){....}-{1:2}, at: debug_show_all_locks+0x7f/0x390 kernel/locking/lockdep.c:6720 2 locks held by kworker/u8:5/793: 2 locks held by getty/4972: #0: ffff88814bbbb0a0 (&tty->ldisc_sem){++++}-{0:0}, at: tty_ldisc_ref_wait+0x24/0x80 drivers/tty/tty_ldisc.c:243 #1: ffffc90002f062f0 (&ldata->atomic_read_lock){+.+.}-{3:3}, at: n_tty_read+0xfba/0x1480 drivers/tty/n_tty.c:2211 2 locks held by syz-executor966/9384: #0: ffff88807b034418 (&mm->mmap_lock){++++}-{3:3}, at: mmap_read_trylock include/linux/mmap_lock.h:163 [inline] #0: ffff88807b034418 (&mm->mmap_lock){++++}-{3:3}, at: get_mmap_lock_carefully mm/memory.c:6099 [inline] #0: ffff88807b034418 (&mm->mmap_lock){++++}-{3:3}, at: lock_mm_and_find_vma+0x35/0x6a0 mm/memory.c:6159 #1: ffff8881412dc698 (&hugetlb_fault_mutex_table[i]){+.+.}-{3:3}, at: hugetlb_wp+0x1b4a/0x3320 mm/hugetlb.c:5894 3 locks held by syz-executor966/9388: #0: ffff888079ca1ec8 (&vma->vm_lock->lock){++++}-{3:3}, at: vma_start_read include/linux/mm.h:704 [inline] #0: ffff888079ca1ec8 (&vma->vm_lock->lock){++++}-{3:3}, at: lock_vma_under_rcu+0x13e/0x980 mm/memory.c:6228 #1: ffff8881412dc698 (&hugetlb_fault_mutex_table[i]){+.+.}-{3:3}, at: hugetlb_fault+0x307/0x2fa0 mm/hugetlb.c:6326 #2: ffff88802db4ace8 (&resv_map->rw_sema){++++}-{3:3}, at: hugetlb_vma_lock_read mm/hugetlb.c:276 [inline] #2: ffff88802db4ace8 (&resv_map->rw_sema){++++}-{3:3}, at: hugetlb_vma_lock_read+0x105/0x140 mm/hugetlb.c:267 2 locks held by syz-executor966/9434: #0: ffff88805f660198 (&mm->mmap_lock){++++}-{3:3}, at: mmap_read_trylock include/linux/mmap_lock.h:163 [inline] #0: ffff88805f660198 (&mm->mmap_lock){++++}-{3:3}, at: get_mmap_lock_carefully mm/memory.c:6099 [inline] #0: ffff88805f660198 (&mm->mmap_lock){++++}-{3:3}, at: lock_mm_and_find_vma+0x35/0x6a0 mm/memory.c:6159 #1: ffff8881412dc698 (&hugetlb_fault_mutex_table[i]){+.+.}-{3:3}, at: hugetlb_fault+0x307/0x2fa0 mm/hugetlb.c:6326 3 locks held by syz-executor966/9437: #0: ffff8881456d0420 (sb_writers#10){.+.+}-{0:0}, at: ksys_fallocate fs/open.c:356 [inline] #0: ffff8881456d0420 (sb_writers#10){.+.+}-{0:0}, at: __do_sys_fallocate fs/open.c:364 [inline] #0: ffff8881456d0420 (sb_writers#10){.+.+}-{0:0}, at: __se_sys_fallocate fs/open.c:362 [inline] #0: ffff8881456d0420 (sb_writers#10){.+.+}-{0:0}, at: __x64_sys_fallocate+0xd9/0x150 fs/open.c:362 #1: ffff888030dd9588 (&sb->s_type->i_mutex_key#15){+.+.}-{3:3}, at: inode_lock include/linux/fs.h:815 [inline] #1: ffff888030dd9588 (&sb->s_type->i_mutex_key#15){+.+.}-{3:3}, at: hugetlbfs_fallocate+0x2b6/0xfc0 fs/hugetlbfs/inode.c:828 #2: ffff8881412dc698 (&hugetlb_fault_mutex_table[i]){+.+.}-{3:3}, at: hugetlbfs_fallocate+0x577/0xfc0 fs/hugetlbfs/inode.c:872 2 locks held by syz-executor966/9679: #0: ffff88807c5a1498 (&mm->mmap_lock){++++}-{3:3}, at: mmap_read_trylock include/linux/mmap_lock.h:163 [inline] #0: ffff88807c5a1498 (&mm->mmap_lock){++++}-{3:3}, at: get_mmap_lock_carefully mm/memory.c:6099 [inline] #0: ffff88807c5a1498 (&mm->mmap_lock){++++}-{3:3}, at: lock_mm_and_find_vma+0x35/0x6a0 mm/memory.c:6159 #1: ffff8881412dc698 (&hugetlb_fault_mutex_table[i]){+.+.}-{3:3}, at: hugetlb_fault+0x307/0x2fa0 mm/hugetlb.c:6326 3 locks held by syz-executor966/9684: #0: ffff8881456d0420 (sb_writers#10){.+.+}-{0:0}, at: ksys_fallocate fs/open.c:356 [inline] #0: ffff8881456d0420 (sb_writers#10){.+.+}-{0:0}, at: __do_sys_fallocate fs/open.c:364 [inline] #0: ffff8881456d0420 (sb_writers#10){.+.+}-{0:0}, at: __se_sys_fallocate fs/open.c:362 [inline] #0: ffff8881456d0420 (sb_writers#10){.+.+}-{0:0}, at: __x64_sys_fallocate+0xd9/0x150 fs/open.c:362 #1: ffff88807a45da98 (&sb->s_type->i_mutex_key#15){+.+.}-{3:3}, at: inode_lock include/linux/fs.h:815 [inline] #1: ffff88807a45da98 (&sb->s_type->i_mutex_key#15){+.+.}-{3:3}, at: hugetlbfs_fallocate+0x2b6/0xfc0 fs/hugetlbfs/inode.c:828 #2: ffff8881412dc698 (&hugetlb_fault_mutex_table[i]){+.+.}-{3:3}, at: hugetlbfs_fallocate+0x577/0xfc0 fs/hugetlbfs/inode.c:872 2 locks held by syz-executor966/9733: #0: ffff88807b17b118 (&mm->mmap_lock){++++}-{3:3}, at: mmap_read_lock_killable include/linux/mmap_lock.h:153 [inline] #0: ffff88807b17b118 (&mm->mmap_lock){++++}-{3:3}, at: get_mmap_lock_carefully mm/memory.c:6108 [inline] #0: ffff88807b17b118 (&mm->mmap_lock){++++}-{3:3}, at: lock_mm_and_find_vma+0x3a9/0x6a0 mm/memory.c:6159 #1: ffff8881412dc698 (&hugetlb_fault_mutex_table[i]){+.+.}-{3:3}, at: hugetlb_fault+0x307/0x2fa0 mm/hugetlb.c:6326 3 locks held by syz-executor966/9735: #0: ffff8881456d0420 (sb_writers#10){.+.+}-{0:0}, at: ksys_fallocate fs/open.c:356 [inline] #0: ffff8881456d0420 (sb_writers#10){.+.+}-{0:0}, at: __do_sys_fallocate fs/open.c:364 [inline] #0: ffff8881456d0420 (sb_writers#10){.+.+}-{0:0}, at: __se_sys_fallocate fs/open.c:362 [inline] #0: ffff8881456d0420 (sb_writers#10){.+.+}-{0:0}, at: __x64_sys_fallocate+0xd9/0x150 fs/open.c:362 #1: ffff88807a45e4b8 (&sb->s_type->i_mutex_key#15){+.+.}-{3:3}, at: inode_lock include/linux/fs.h:815 [inline] #1: ffff88807a45e4b8 (&sb->s_type->i_mutex_key#15){+.+.}-{3:3}, at: hugetlbfs_fallocate+0x2b6/0xfc0 fs/hugetlbfs/inode.c:828 #2: ffff8881412dc698 (&hugetlb_fault_mutex_table[i]){+.+.}-{3:3}, at: hugetlbfs_fallocate+0x577/0xfc0 fs/hugetlbfs/inode.c:872 2 locks held by syz-executor966/9786: #0: ffff88805f768198 (&mm->mmap_lock){++++}-{3:3}, at: mmap_read_lock_killable include/linux/mmap_lock.h:153 [inline] #0: ffff88805f768198 (&mm->mmap_lock){++++}-{3:3}, at: get_mmap_lock_carefully mm/memory.c:6108 [inline] #0: ffff88805f768198 (&mm->mmap_lock){++++}-{3:3}, at: lock_mm_and_find_vma+0x3a9/0x6a0 mm/memory.c:6159 #1: ffff8881412dc698 (&hugetlb_fault_mutex_table[i]){+.+.}-{3:3}, at: hugetlb_fault+0x307/0x2fa0 mm/hugetlb.c:6326 3 locks held by syz-executor966/9787: #0: ffff8881456d0420 (sb_writers#10){.+.+}-{0:0}, at: ksys_fallocate fs/open.c:356 [inline] #0: ffff8881456d0420 (sb_writers#10){.+.+}-{0:0}, at: __do_sys_fallocate fs/open.c:364 [inline] #0: ffff8881456d0420 (sb_writers#10){.+.+}-{0:0}, at: __se_sys_fallocate fs/open.c:362 [inline] #0: ffff8881456d0420 (sb_writers#10){.+.+}-{0:0}, at: __x64_sys_fallocate+0xd9/0x150 fs/open.c:362 #1: ffff88807a910148 (&sb->s_type->i_mutex_key#15){+.+.}-{3:3}, at: inode_lock include/linux/fs.h:815 [inline] #1: ffff88807a910148 (&sb->s_type->i_mutex_key#15){+.+.}-{3:3}, at: hugetlbfs_fallocate+0x2b6/0xfc0 fs/hugetlbfs/inode.c:828 #2: ffff8881412dc698 (&hugetlb_fault_mutex_table[i]){+.+.}-{3:3}, at: hugetlbfs_fallocate+0x577/0xfc0 fs/hugetlbfs/inode.c:872 ============================================= NMI backtrace for cpu 1 CPU: 1 UID: 0 PID: 30 Comm: khungtaskd Not tainted 6.12.0-rc2-syzkaller-00061-gb983b271662b #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 09/13/2024 Call Trace: <TASK> __dump_stack lib/dump_stack.c:94 [inline] dump_stack_lvl+0x116/0x1f0 lib/dump_stack.c:120 nmi_cpu_backtrace+0x27b/0x390 lib/nmi_backtrace.c:113 nmi_trigger_cpumask_backtrace+0x29c/0x300 lib/nmi_backtrace.c:62 trigger_all_cpu_backtrace include/linux/nmi.h:162 [inline] check_hung_uninterruptible_tasks kernel/hung_task.c:223 [inline] watchdog+0xf0c/0x1240 kernel/hung_task.c:379 kthread+0x2c1/0x3a0 kernel/kthread.c:389 ret_from_fork+0x45/0x80 arch/x86/kernel/process.c:147 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:244 </TASK> Sending NMI from CPU 1 to CPUs 0: NMI backtrace for cpu 0 CPU: 0 UID: 0 PID: 4662 Comm: klogd Not tainted 6.12.0-rc2-syzkaller-00061-gb983b271662b #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 09/13/2024 RIP: 0010:check_kcov_mode kernel/kcov.c:183 [inline] RIP: 0010:__sanitizer_cov_trace_pc+0x13/0x70 kernel/kcov.c:217 Code: 84 00 00 00 00 00 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 f3 0f 1e fa 65 48 8b 15 64 59 76 7e 65 8b 05 65 59 76 7e <a9> 00 01 ff 00 48 8b 34 24 74 1d f6 c4 01 74 43 a9 00 00 0f 00 75 RSP: 0018:ffffc900033efaa0 EFLAGS: 00000293 RAX: 0000000080000000 RBX: 0000000000000000 RCX: ffffffff84430a29 RDX: ffff88807d2f5a00 RSI: ffffffff844309e3 RDI: 0000000000000005 RBP: ffff8880248e98c0 R08: 0000000000000005 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000000 R12: ffff888079859c80 R13: 0000000000000001 R14: ffff8880248e98c0 R15: ffff8880248e98c0 FS: 00007efe5ee35380(0000) GS:ffff8880b8600000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00005638ed3e1400 CR3: 000000007c050000 CR4: 00000000003526f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: <NMI> </NMI> <TASK> arch_static_branch arch/x86/include/asm/jump_label.h:27 [inline] security_sock_rcv_skb+0x5d/0x210 security/security.c:4748 sk_filter_trim_cap+0xd2/0xac0 net/core/filter.c:151 sk_filter include/linux/filter.h:1062 [inline] unix_dgram_sendmsg+0x66a/0x19e0 net/unix/af_unix.c:2061 sock_sendmsg_nosec net/socket.c:729 [inline] __sock_sendmsg net/socket.c:744 [inline] __sys_sendto+0x479/0x4d0 net/socket.c:2209 __do_sys_sendto net/socket.c:2221 [inline] __se_sys_sendto net/socket.c:2217 [inline] __x64_sys_sendto+0xe0/0x1c0 net/socket.c:2217 do_syscall_x64 arch/x86/entry/common.c:52 [inline] do_syscall_64+0xcd/0x250 arch/x86/entry/common.c:83 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7efe5ef979b5 Code: 8b 44 24 08 48 83 c4 28 48 98 c3 48 98 c3 41 89 ca 64 8b 04 25 18 00 00 00 85 c0 75 26 45 31 c9 45 31 c0 b8 2c 00 00 00 0f 05 <48> 3d 00 f0 ff ff 76 7a 48 8b 15 44 c4 0c 00 f7 d8 64 89 02 48 83 RSP: 002b:00007ffdfcdf97a8 EFLAGS: 00000246 ORIG_RAX: 000000000000002c RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 00007efe5ef979b5 RDX: 000000000000008b RSI: 000055ec577dbd60 RDI: 0000000000000003 RBP: 000055ec577d52c0 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000004000 R11: 0000000000000246 R12: 0000000000000013 R13: 00007efe5f125212 R14: 00007ffdfcdf98a8 R15: 0000000000000000 </TASK> INFO: NMI handler (nmi_cpu_backtrace_handler) took too long to run: 1.352 msecs --- If you want syzbot to run the reproducer, reply with: #syz test: git://repo/address.git branch-or-commit-hash If you attach or paste a git patch, syzbot will apply it before testing.
