Hello, syzbot found the following issue on: HEAD commit: f44d154d6e3d Merge tag 'soc-fixes-6.13' of git://git.kerne.. git tree: upstream console output: https://syzkaller.appspot.com/x/log.txt?x=117e4744580000 kernel config: https://syzkaller.appspot.com/x/.config?x=6a2b862bf4a5409f dashboard link: https://syzkaller.appspot.com/bug?extid=1c6e77303b6fae1f5957 compiler: Debian clang version 15.0.6, GNU ld (GNU Binutils for Debian) 2.40 syz repro: https://syzkaller.appspot.com/x/repro.syz?x=16f8a7e8580000 Downloadable assets: disk image: https://storage.googleapis.com/syzbot-assets/e8be4151807d/disk-f44d154d.raw.xz vmlinux: https://storage.googleapis.com/syzbot-assets/a5f22853d301/vmlinux-f44d154d.xz kernel image: https://storage.googleapis.com/syzbot-assets/d7a4a78964e0/bzImage-f44d154d.xz The issue was bisected to: commit 72e315f7a750281b4410ac30d8930f735459e72d Author: Hugh Dickins <hughd@xxxxxxxxxx> Date: Tue Oct 3 09:27:47 2023 +0000 mempolicy: mmap_lock is not needed while migrating folios bisection log: https://syzkaller.appspot.com/x/bisect.txt?x=154877e8580000 final oops: https://syzkaller.appspot.com/x/report.txt?x=174877e8580000 console output: https://syzkaller.appspot.com/x/log.txt?x=134877e8580000 IMPORTANT: if you fix the issue, please add the following tag to the commit: Reported-by: syzbot+1c6e77303b6fae1f5957@xxxxxxxxxxxxxxxxxxxxxxxxx Fixes: 72e315f7a750 ("mempolicy: mmap_lock is not needed while migrating folios") INFO: task syz.3.1803:9905 blocked for more than 143 seconds. Not tainted 6.13.0-rc3-syzkaller-00017-gf44d154d6e3d #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. task:syz.3.1803 state:D stack:22160 pid:9905 tgid:9904 ppid:5954 flags:0x00000004 Call Trace: <TASK> context_switch kernel/sched/core.c:5369 [inline] __schedule+0x1850/0x4c30 kernel/sched/core.c:6756 __schedule_loop kernel/sched/core.c:6833 [inline] schedule+0x14b/0x320 kernel/sched/core.c:6848 io_schedule+0x8d/0x110 kernel/sched/core.c:7681 folio_wait_bit_common+0x839/0xee0 mm/filemap.c:1308 __folio_lock mm/filemap.c:1646 [inline] folio_lock include/linux/pagemap.h:1151 [inline] __filemap_get_folio+0x14c/0x940 mm/filemap.c:1899 filemap_lock_folio include/linux/pagemap.h:788 [inline] filemap_lock_hugetlb_folio include/linux/hugetlb.h:789 [inline] hugetlbfs_zero_partial_page+0xb0/0x590 fs/hugetlbfs/inode.c:661 hugetlbfs_punch_hole fs/hugetlbfs/inode.c:715 [inline] hugetlbfs_fallocate+0xbdd/0x11a0 fs/hugetlbfs/inode.c:748 vfs_fallocate+0x56b/0x6e0 fs/open.c:327 madvise_remove mm/madvise.c:1020 [inline] madvise_vma_behavior mm/madvise.c:1255 [inline] madvise_walk_vmas mm/madvise.c:1497 [inline] do_madvise+0x23c1/0x4d10 mm/madvise.c:1684 __do_sys_madvise mm/madvise.c:1700 [inline] __se_sys_madvise mm/madvise.c:1698 [inline] __x64_sys_madvise+0xa6/0xc0 mm/madvise.c:1698 do_syscall_x64 arch/x86/entry/common.c:52 [inline] do_syscall_64+0xf3/0x230 arch/x86/entry/common.c:83 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7fa4fef85d19 RSP: 002b:00007fa4ffdff038 EFLAGS: 00000246 ORIG_RAX: 000000000000001c RAX: ffffffffffffffda RBX: 00007fa4ff175fa0 RCX: 00007fa4fef85d19 RDX: 0000000000000009 RSI: 0000000000600002 RDI: 0000000020000000 RBP: 00007fa4ff001a20 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 0000000000000000 R14: 00007fa4ff175fa0 R15: 00007ffd7e368038 </TASK> INFO: task syz.3.1803:9910 blocked for more than 144 seconds. Not tainted 6.13.0-rc3-syzkaller-00017-gf44d154d6e3d #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. task:syz.3.1803 state:D stack:27120 pid:9910 tgid:9904 ppid:5954 flags:0x00004004 Call Trace: <TASK> context_switch kernel/sched/core.c:5369 [inline] __schedule+0x1850/0x4c30 kernel/sched/core.c:6756 __schedule_loop kernel/sched/core.c:6833 [inline] schedule+0x14b/0x320 kernel/sched/core.c:6848 schedule_preempt_disabled+0x13/0x30 kernel/sched/core.c:6905 rwsem_down_read_slowpath kernel/locking/rwsem.c:1084 [inline] __down_read_common kernel/locking/rwsem.c:1248 [inline] __down_read kernel/locking/rwsem.c:1261 [inline] down_read+0x705/0xa40 kernel/locking/rwsem.c:1526 i_mmap_lock_read include/linux/fs.h:529 [inline] rmap_walk_file+0x69c/0x780 mm/rmap.c:2694 remove_migration_ptes mm/migrate.c:373 [inline] unmap_and_move_huge_page mm/migrate.c:1526 [inline] migrate_hugetlbs mm/migrate.c:1648 [inline] migrate_pages+0xd26/0x3380 mm/migrate.c:2046 do_mbind mm/mempolicy.c:1394 [inline] kernel_mbind mm/mempolicy.c:1537 [inline] __do_sys_mbind mm/mempolicy.c:1611 [inline] __se_sys_mbind+0x145b/0x18d0 mm/mempolicy.c:1607 do_syscall_x64 arch/x86/entry/common.c:52 [inline] do_syscall_64+0xf3/0x230 arch/x86/entry/common.c:83 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7fa4fef85d19 RSP: 002b:00007fa4ffdab038 EFLAGS: 00000246 ORIG_RAX: 00000000000000ed RAX: ffffffffffffffda RBX: 00007fa4ff176080 RCX: 00007fa4fef85d19 RDX: 0000000000000000 RSI: 0000000000800000 RDI: 0000000020001000 RBP: 00007fa4ff001a20 R08: 0000000000000000 R09: 0000000000000002 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 0000000000000001 R14: 00007fa4ff176080 R15: 00007ffd7e368038 </TASK> Showing all locks held in the system: 4 locks held by kworker/u8:1/12: 1 lock held by khungtaskd/30: #0: ffffffff8e937ae0 (rcu_read_lock){....}-{1:3}, at: rcu_lock_acquire include/linux/rcupdate.h:337 [inline] #0: ffffffff8e937ae0 (rcu_read_lock){....}-{1:3}, at: rcu_read_lock include/linux/rcupdate.h:849 [inline] #0: ffffffff8e937ae0 (rcu_read_lock){....}-{1:3}, at: debug_show_all_locks+0x55/0x2a0 kernel/locking/lockdep.c:6744 1 lock held by udevd/5197: 1 lock held by dhcpcd/5491: #0: ffffffff8fcb2888 (rtnl_mutex){+.+.}-{4:4}, at: rtnl_net_lock include/linux/rtnetlink.h:128 [inline] #0: ffffffff8fcb2888 (rtnl_mutex){+.+.}-{4:4}, at: devinet_ioctl+0x31a/0x1ac0 net/ipv4/devinet.c:1129 2 locks held by getty/5586: #0: ffff8880313710a0 (&tty->ldisc_sem){++++}-{0:0}, at: tty_ldisc_ref_wait+0x25/0x70 drivers/tty/tty_ldisc.c:243 #1: ffffc90002fd62f0 (&ldata->atomic_read_lock){+.+.}-{4:4}, at: n_tty_read+0x6a6/0x1e00 drivers/tty/n_tty.c:2211 2 locks held by kworker/0:3/5810: #0: ffff8880b863e8d8 (&rq->__lock){-.-.}-{2:2}, at: raw_spin_rq_lock_nested+0x2a/0x140 kernel/sched/core.c:598 #1: ffff8880b8628948 (&per_cpu_ptr(group->pcpu, cpu)->seq){-.-.}-{0:0}, at: psi_task_switch+0x41d/0x7a0 kernel/sched/psi.c:987 3 locks held by kworker/u8:8/6048: #0: ffff88801ac81148 ((wq_completion)events_unbound){+.+.}-{0:0}, at: process_one_work kernel/workqueue.c:3204 [inline] #0: ffff88801ac81148 ((wq_completion)events_unbound){+.+.}-{0:0}, at: process_scheduled_works+0x93b/0x1840 kernel/workqueue.c:3310 #1: ffffc900046d7d00 ((linkwatch_work).work){+.+.}-{0:0}, at: process_one_work kernel/workqueue.c:3205 [inline] #1: ffffc900046d7d00 ((linkwatch_work).work){+.+.}-{0:0}, at: process_scheduled_works+0x976/0x1840 kernel/workqueue.c:3310 #2: ffffffff8fcb2888 (rtnl_mutex){+.+.}-{4:4}, at: linkwatch_event+0xe/0x60 net/core/link_watch.c:281 3 locks held by syz.3.1803/9905: #0: ffff8881436e6420 (sb_writers#13){.+.+}-{0:0}, at: file_start_write include/linux/fs.h:2964 [inline] #0: ffff8881436e6420 (sb_writers#13){.+.+}-{0:0}, at: vfs_fallocate+0x4fe/0x6e0 fs/open.c:326 #1: ffff888024d19078 (&sb->s_type->i_mutex_key#21){+.+.}-{4:4}, at: inode_lock include/linux/fs.h:818 [inline] #1: ffff888024d19078 (&sb->s_type->i_mutex_key#21){+.+.}-{4:4}, at: hugetlbfs_punch_hole fs/hugetlbfs/inode.c:690 [inline] #1: ffff888024d19078 (&sb->s_type->i_mutex_key#21){+.+.}-{4:4}, at: hugetlbfs_fallocate+0x407/0x11a0 fs/hugetlbfs/inode.c:748 #2: ffff888024d19348 (&hugetlbfs_i_mmap_rwsem_key){++++}-{4:4}, at: i_mmap_lock_write include/linux/fs.h:509 [inline] #2: ffff888024d19348 (&hugetlbfs_i_mmap_rwsem_key){++++}-{4:4}, at: hugetlbfs_punch_hole fs/hugetlbfs/inode.c:698 [inline] #2: ffff888024d19348 (&hugetlbfs_i_mmap_rwsem_key){++++}-{4:4}, at: hugetlbfs_fallocate+0x4cd/0x11a0 fs/hugetlbfs/inode.c:748 1 lock held by syz.3.1803/9910: #0: ffff888024d19348 (&hugetlbfs_i_mmap_rwsem_key){++++}-{4:4}, at: i_mmap_lock_read include/linux/fs.h:529 [inline] #0: ffff888024d19348 (&hugetlbfs_i_mmap_rwsem_key){++++}-{4:4}, at: rmap_walk_file+0x69c/0x780 mm/rmap.c:2694 1 lock held by syz.6.2635/11669: #0: ffff888077021858 (&hugetlbfs_i_mmap_rwsem_key){++++}-{4:4}, at: i_mmap_lock_read include/linux/fs.h:529 [inline] #0: ffff888077021858 (&hugetlbfs_i_mmap_rwsem_key){++++}-{4:4}, at: rmap_walk_file+0x69c/0x780 mm/rmap.c:2694 3 locks held by syz.6.2635/11677: #0: ffff8881436e6420 (sb_writers#13){.+.+}-{0:0}, at: file_start_write include/linux/fs.h:2964 [inline] #0: ffff8881436e6420 (sb_writers#13){.+.+}-{0:0}, at: vfs_fallocate+0x4fe/0x6e0 fs/open.c:326 #1: ffff888077021588 (&sb->s_type->i_mutex_key#21){+.+.}-{4:4}, at: inode_lock include/linux/fs.h:818 [inline] #1: ffff888077021588 (&sb->s_type->i_mutex_key#21){+.+.}-{4:4}, at: hugetlbfs_punch_hole fs/hugetlbfs/inode.c:690 [inline] #1: ffff888077021588 (&sb->s_type->i_mutex_key#21){+.+.}-{4:4}, at: hugetlbfs_fallocate+0x407/0x11a0 fs/hugetlbfs/inode.c:748 #2: ffff888077021858 (&hugetlbfs_i_mmap_rwsem_key){++++}-{4:4}, at: i_mmap_lock_write include/linux/fs.h:509 [inline] #2: ffff888077021858 (&hugetlbfs_i_mmap_rwsem_key){++++}-{4:4}, at: hugetlbfs_punch_hole fs/hugetlbfs/inode.c:698 [inline] #2: ffff888077021858 (&hugetlbfs_i_mmap_rwsem_key){++++}-{4:4}, at: hugetlbfs_fallocate+0x4cd/0x11a0 fs/hugetlbfs/inode.c:748 2 locks held by syz-executor/21337: #0: ffffffff8f45c1e0 (&ops->srcu#2){.+.+}-{0:0}, at: rcu_lock_acquire include/linux/rcupdate.h:337 [inline] #0: ffffffff8f45c1e0 (&ops->srcu#2){.+.+}-{0:0}, at: rcu_read_lock include/linux/rcupdate.h:849 [inline] #0: ffffffff8f45c1e0 (&ops->srcu#2){.+.+}-{0:0}, at: rtnl_link_ops_get+0x22/0x250 net/core/rtnetlink.c:555 #1: ffffffff8fcb2888 (rtnl_mutex){+.+.}-{4:4}, at: rtnl_lock net/core/rtnetlink.c:79 [inline] #1: ffffffff8fcb2888 (rtnl_mutex){+.+.}-{4:4}, at: rtnl_nets_lock net/core/rtnetlink.c:326 [inline] #1: ffffffff8fcb2888 (rtnl_mutex){+.+.}-{4:4}, at: rtnl_newlink+0xbcb/0x2150 net/core/rtnetlink.c:4010 1 lock held by syz.5.7438/22297: #0: ffffffff8e93cff8 (rcu_state.exp_mutex){+.+.}-{4:4}, at: exp_funnel_lock kernel/rcu/tree_exp.h:329 [inline] #0: ffffffff8e93cff8 (rcu_state.exp_mutex){+.+.}-{4:4}, at: synchronize_rcu_expedited+0x451/0x830 kernel/rcu/tree_exp.h:976 ============================================= NMI backtrace for cpu 0 CPU: 0 UID: 0 PID: 30 Comm: khungtaskd Not tainted 6.13.0-rc3-syzkaller-00017-gf44d154d6e3d #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 11/25/2024 Call Trace: <TASK> __dump_stack lib/dump_stack.c:94 [inline] dump_stack_lvl+0x241/0x360 lib/dump_stack.c:120 nmi_cpu_backtrace+0x49c/0x4d0 lib/nmi_backtrace.c:113 nmi_trigger_cpumask_backtrace+0x198/0x320 lib/nmi_backtrace.c:62 trigger_all_cpu_backtrace include/linux/nmi.h:162 [inline] check_hung_uninterruptible_tasks kernel/hung_task.c:234 [inline] watchdog+0xff6/0x1040 kernel/hung_task.c:397 kthread+0x2f2/0x390 kernel/kthread.c:389 ret_from_fork+0x4d/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 0 to CPUs 1: NMI backtrace for cpu 1 CPU: 1 UID: 0 PID: 5197 Comm: udevd Not tainted 6.13.0-rc3-syzkaller-00017-gf44d154d6e3d #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 11/25/2024 RIP: 0010:validate_chain+0x15/0x5920 kernel/locking/lockdep.c:3860 Code: 02 4d 0a 66 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 f3 0f 1e fa 55 48 89 e5 41 57 41 56 41 55 41 54 53 48 83 e4 e0 <48> 81 ec c0 02 00 00 49 89 ce 89 54 24 58 48 89 bc 24 80 00 00 00 RSP: 0018:ffffc90004827700 EFLAGS: 00000086 RAX: 1ffffffff2783629 RBX: ffffffff93c1b148 RCX: 58cce5e7c8d5ebdc RDX: 0000000000000001 RSI: ffff88807d7a64e0 RDI: ffff88807d7a5a00 RBP: ffffc90004827740 R08: ffffffff942a1887 R09: 1ffffffff2854310 R10: dffffc0000000000 R11: fffffbfff2854311 R12: ffff88807d7a5a00 R13: ffff88807d7a5a00 R14: 1ffff1100faf4ca0 R15: 0000000000000001 FS: 00007f2066ba4c80(0000) GS:ffff8880b8700000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007f6e7cffdf98 CR3: 000000007c9ba000 CR4: 0000000000350ef0 Call Trace: <NMI> </NMI> <TASK> __lock_acquire+0x1397/0x2100 kernel/locking/lockdep.c:5226 lock_acquire+0x1ed/0x550 kernel/locking/lockdep.c:5849 rcu_lock_acquire include/linux/rcupdate.h:337 [inline] rcu_read_lock include/linux/rcupdate.h:849 [inline] __d_lookup+0x81/0x7b0 fs/dcache.c:2331 lookup_fast+0x74/0x4a0 fs/namei.c:1749 walk_component fs/namei.c:2108 [inline] link_path_walk+0x672/0xea0 fs/namei.c:2477 path_lookupat+0xa9/0x450 fs/namei.c:2633 filename_lookup+0x2a3/0x670 fs/namei.c:2663 do_readlinkat+0xf0/0x3a0 fs/stat.c:562 __do_sys_readlink fs/stat.c:599 [inline] __se_sys_readlink fs/stat.c:596 [inline] __x64_sys_readlink+0x7f/0x90 fs/stat.c:596 do_syscall_x64 arch/x86/entry/common.c:52 [inline] do_syscall_64+0xf3/0x230 arch/x86/entry/common.c:83 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7f2066717d47 Code: 73 01 c3 48 8b 0d e1 90 0d 00 f7 d8 64 89 01 48 83 c8 ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 44 00 00 b8 59 00 00 00 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 8b 0d b1 90 0d 00 f7 d8 64 89 01 48 RSP: 002b:00007ffd34177f68 EFLAGS: 00000246 ORIG_RAX: 0000000000000059 RAX: ffffffffffffffda RBX: 00007ffd34177f78 RCX: 00007f2066717d47 RDX: 0000000000000400 RSI: 00007ffd34177f78 RDI: 00007ffd34178458 RBP: 0000000000000400 R08: 000055cbc6b605a4 R09: 0000000000000000 R10: 0000000000000812 R11: 0000000000000246 R12: 00007ffd34178458 R13: 00007ffd341783c8 R14: 000055cbc6b4c910 R15: 0000000000000000 </TASK> --- This report is generated by a bot. It may contain errors. See https://goo.gl/tpsmEJ for more information about syzbot. syzbot engineers can be reached at syzkaller@xxxxxxxxxxxxxxxx. syzbot will keep track of this issue. See: https://goo.gl/tpsmEJ#status for how to communicate with syzbot. For information about bisection process see: https://goo.gl/tpsmEJ#bisection If the report is already addressed, let syzbot know by replying with: #syz fix: exact-commit-title 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. If you want to overwrite report's subsystems, reply with: #syz set subsystems: new-subsystem (See the list of subsystem names on the web dashboard) If the report is a duplicate of another one, reply with: #syz dup: exact-subject-of-another-report If you want to undo deduplication, reply with: #syz undup
