syzbot has found a reproducer for the following issue on: HEAD commit: 089866061428 Merge tag 'libnvdimm-fixes-5.19-rc5' of git:/.. git tree: upstream console+strace: https://syzkaller.appspot.com/x/log.txt?x=13b60400080000 kernel config: https://syzkaller.appspot.com/x/.config?x=833001d0819ddbc9 dashboard link: https://syzkaller.appspot.com/bug?extid=be946efe33b2d9664348 compiler: gcc (Debian 10.2.1-6) 10.2.1 20210110, GNU ld (GNU Binutils for Debian) 2.35.2 syz repro: https://syzkaller.appspot.com/x/repro.syz?x=116c61f4080000 C reproducer: https://syzkaller.appspot.com/x/repro.c?x=13805fd4080000 IMPORTANT: if you fix the issue, please add the following tag to the commit: Reported-by: syzbot+be946efe33b2d9664348@xxxxxxxxxxxxxxxxxxxxxxxxx INFO: task udevd:3614 blocked for more than 143 seconds. Not tainted 5.19.0-rc4-syzkaller-00187-g089866061428 #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. task:udevd state:D stack:26160 pid: 3614 ppid: 2974 flags:0x00004004 Call Trace: <TASK> context_switch kernel/sched/core.c:5146 [inline] __schedule+0xa00/0x4b50 kernel/sched/core.c:6458 schedule+0xd2/0x1f0 kernel/sched/core.c:6530 io_schedule+0xba/0x130 kernel/sched/core.c:8645 folio_wait_bit_common+0x4f2/0xa90 mm/filemap.c:1324 folio_wait_bit mm/filemap.c:1473 [inline] folio_wait_locked include/linux/pagemap.h:1028 [inline] folio_wait_locked include/linux/pagemap.h:1025 [inline] do_read_cache_folio+0x4ff/0x760 mm/filemap.c:3530 do_read_cache_page mm/filemap.c:3602 [inline] read_cache_page+0x59/0x2a0 mm/filemap.c:3611 read_mapping_page include/linux/pagemap.h:759 [inline] read_part_sector+0xf6/0x920 block/partitions/core.c:715 adfspart_check_ICS+0x9a/0x690 block/partitions/acorn.c:360 check_partition block/partitions/core.c:147 [inline] blk_add_partitions block/partitions/core.c:600 [inline] bdev_disk_changed block/partitions/core.c:686 [inline] bdev_disk_changed+0x629/0xf60 block/partitions/core.c:653 blkdev_get_whole+0x18a/0x2d0 block/bdev.c:686 blkdev_get_by_dev.part.0+0x5ec/0xb90 block/bdev.c:823 blkdev_get_by_dev+0x6b/0x80 block/bdev.c:857 blkdev_open+0x13c/0x2c0 block/fops.c:481 do_dentry_open+0x4a1/0x11f0 fs/open.c:848 do_open fs/namei.c:3520 [inline] path_openat+0x1c71/0x2910 fs/namei.c:3653 do_filp_open+0x1aa/0x400 fs/namei.c:3680 do_sys_openat2+0x16d/0x4c0 fs/open.c:1278 do_sys_open fs/open.c:1294 [inline] __do_sys_openat fs/open.c:1310 [inline] __se_sys_openat fs/open.c:1305 [inline] __x64_sys_openat+0x13f/0x1f0 fs/open.c:1305 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x35/0xb0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x46/0xb0 RIP: 0033:0x7f2cc1991697 RSP: 002b:00007fff60a9cbc0 EFLAGS: 00000246 ORIG_RAX: 0000000000000101 RAX: ffffffffffffffda RBX: 000056135a372c20 RCX: 00007f2cc1991697 RDX: 00000000000a0800 RSI: 000056135a36ab20 RDI: 00000000ffffff9c RBP: 000056135a36ab20 R08: 0000000000000001 R09: 00007fff60ba0080 R10: 0000000000000000 R11: 0000000000000246 R12: 00000000000a0800 R13: 000056135a368130 R14: 0000000000000001 R15: 000056135a347910 </TASK> INFO: task syz-executor325:3615 blocked for more than 143 seconds. Not tainted 5.19.0-rc4-syzkaller-00187-g089866061428 #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. task:syz-executor325 state:D stack:27272 pid: 3615 ppid: 3613 flags:0x00004006 Call Trace: <TASK> context_switch kernel/sched/core.c:5146 [inline] __schedule+0xa00/0x4b50 kernel/sched/core.c:6458 schedule+0xd2/0x1f0 kernel/sched/core.c:6530 schedule_preempt_disabled+0xf/0x20 kernel/sched/core.c:6589 __mutex_lock_common kernel/locking/mutex.c:679 [inline] __mutex_lock+0xa70/0x1350 kernel/locking/mutex.c:747 blkdev_put+0xbc/0x770 block/bdev.c:912 blkdev_close+0x64/0x80 block/fops.c:495 __fput+0x277/0x9d0 fs/file_table.c:317 task_work_run+0xdd/0x1a0 kernel/task_work.c:177 exit_task_work include/linux/task_work.h:38 [inline] do_exit+0xaff/0x2a00 kernel/exit.c:795 do_group_exit+0xd2/0x2f0 kernel/exit.c:925 get_signal+0x2542/0x2600 kernel/signal.c:2857 arch_do_signal_or_restart+0x82/0x2300 arch/x86/kernel/signal.c:869 exit_to_user_mode_loop kernel/entry/common.c:166 [inline] exit_to_user_mode_prepare+0x15f/0x250 kernel/entry/common.c:201 __syscall_exit_to_user_mode_work kernel/entry/common.c:283 [inline] syscall_exit_to_user_mode+0x19/0x50 kernel/entry/common.c:294 do_syscall_64+0x42/0xb0 arch/x86/entry/common.c:86 entry_SYSCALL_64_after_hwframe+0x46/0xb0 RIP: 0033:0x7f38c3b625e9 RSP: 002b:00007ffe69332538 EFLAGS: 00000246 ORIG_RAX: 0000000000000010 RAX: fffffffffffffe00 RBX: 0000000000000003 RCX: 00007f38c3b625e9 RDX: 0000000000000000 RSI: 000000000000ab03 RDI: 0000000000000006 RBP: 0000000000000000 R08: 0000000000000000 R09: 0000000000000000 R10: 000000000000ffff R11: 0000000000000246 R12: 00007ffe693325b0 R13: 00007ffe693325a0 R14: 00007ffe69332590 R15: 000000000000000c </TASK> Showing all locks held in the system: 1 lock held by khungtaskd/27: #0: ffffffff8bd86660 (rcu_read_lock){....}-{1:2}, at: debug_show_all_locks+0x53/0x260 kernel/locking/lockdep.c:6491 2 locks held by getty/3288: #0: ffff888025b35098 (&tty->ldisc_sem){++++}-{0:0}, at: tty_ldisc_ref_wait+0x22/0x80 drivers/tty/tty_ldisc.c:244 #1: ffffc90002d162e8 (&ldata->atomic_read_lock){+.+.}-{3:3}, at: n_tty_read+0xe50/0x13c0 drivers/tty/n_tty.c:2124 1 lock held by udevd/3614: #0: ffff8881472ee118 (&disk->open_mutex){+.+.}-{3:3}, at: blkdev_get_by_dev.part.0+0x9b/0xb90 block/bdev.c:814 1 lock held by syz-executor325/3615: #0: ffff8881472ee118 (&disk->open_mutex){+.+.}-{3:3}, at: blkdev_put+0xbc/0x770 block/bdev.c:912 ============================================= NMI backtrace for cpu 0 CPU: 0 PID: 27 Comm: khungtaskd Not tainted 5.19.0-rc4-syzkaller-00187-g089866061428 #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 06/29/2022 Call Trace: <TASK> __dump_stack lib/dump_stack.c:88 [inline] dump_stack_lvl+0xcd/0x134 lib/dump_stack.c:106 nmi_cpu_backtrace.cold+0x47/0x144 lib/nmi_backtrace.c:111 nmi_trigger_cpumask_backtrace+0x1e6/0x230 lib/nmi_backtrace.c:62 trigger_all_cpu_backtrace include/linux/nmi.h:146 [inline] check_hung_uninterruptible_tasks kernel/hung_task.c:212 [inline] watchdog+0xc1d/0xf50 kernel/hung_task.c:369 kthread+0x2e9/0x3a0 kernel/kthread.c:376 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:302 </TASK> Sending NMI from CPU 0 to CPUs 1: NMI backtrace for cpu 1 CPU: 1 PID: 11 Comm: kworker/u4:1 Not tainted 5.19.0-rc4-syzkaller-00187-g089866061428 #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 06/29/2022 Workqueue: events_unbound toggle_allocation_gate RIP: 0010:check_preemption_disabled+0x3e/0x170 lib/smp_processor_id.c:56 Code: 44 8b 25 c5 b6 8a 76 65 8b 1d 2e 0c 8b 76 81 e3 ff ff ff 7f 31 ff 89 de 0f 1f 44 00 00 85 db 74 11 0f 1f 44 00 00 44 89 e0 5b <5d> 41 5c 41 5d 41 5e c3 0f 1f 44 00 00 9c 5b 81 e3 00 02 00 00 31 RSP: 0018:ffffc90000107850 EFLAGS: 00000206 RAX: 0000000000000001 RBX: 1ffff92000020f16 RCX: ffffffff815e59a8 RDX: 0000000000000001 RSI: 0000000000000003 RDI: 0000000000000000 RBP: ffffffff8a285700 R08: 0000000000000000 R09: ffffffff8dbb9157 R10: fffffbfff1b7722a R11: 0000000000000001 R12: 0000000000000001 R13: ffffffff8a2856c0 R14: ffff8880119c1138 R15: 0000000000000000 FS: 0000000000000000(0000) GS:ffff8880b9b00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 000055f2dd4a4680 CR3: 000000000ba8e000 CR4: 0000000000350ee0 Call Trace: <TASK> rcu_lockdep_current_cpu_online kernel/rcu/tree.c:1185 [inline] rcu_lockdep_current_cpu_online+0x2d/0x140 kernel/rcu/tree.c:1177 rcu_read_lock_held_common kernel/rcu/update.c:112 [inline] rcu_read_lock_held_common kernel/rcu/update.c:102 [inline] rcu_read_lock_sched_held+0x25/0x70 kernel/rcu/update.c:123 trace_lock_acquire include/trace/events/lock.h:24 [inline] lock_acquire+0x480/0x570 kernel/locking/lockdep.c:5636 __raw_spin_lock include/linux/spinlock_api_smp.h:133 [inline] _raw_spin_lock+0x2a/0x40 kernel/locking/spinlock.c:154 spin_lock include/linux/spinlock.h:349 [inline] __get_locked_pte+0x154/0x270 mm/memory.c:1830 get_locked_pte include/linux/mm.h:2132 [inline] __text_poke+0x1b3/0x8e0 arch/x86/kernel/alternative.c:1052 text_poke arch/x86/kernel/alternative.c:1137 [inline] text_poke_bp_batch+0x44a/0x6c0 arch/x86/kernel/alternative.c:1483 text_poke_flush arch/x86/kernel/alternative.c:1589 [inline] text_poke_flush arch/x86/kernel/alternative.c:1586 [inline] text_poke_finish+0x16/0x30 arch/x86/kernel/alternative.c:1596 arch_jump_label_transform_apply+0x13/0x20 arch/x86/kernel/jump_label.c:146 jump_label_update+0x32f/0x410 kernel/jump_label.c:830 static_key_enable_cpuslocked+0x1b1/0x260 kernel/jump_label.c:177 static_key_enable+0x16/0x20 kernel/jump_label.c:190 toggle_allocation_gate mm/kfence/core.c:811 [inline] toggle_allocation_gate+0x100/0x390 mm/kfence/core.c:803 process_one_work+0x996/0x1610 kernel/workqueue.c:2289 worker_thread+0x665/0x1080 kernel/workqueue.c:2436 kthread+0x2e9/0x3a0 kernel/kthread.c:376 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:302 </TASK> ---------------- Code disassembly (best guess): 0: 44 8b 25 c5 b6 8a 76 mov 0x768ab6c5(%rip),%r12d # 0x768ab6cc 7: 65 8b 1d 2e 0c 8b 76 mov %gs:0x768b0c2e(%rip),%ebx # 0x768b0c3c e: 81 e3 ff ff ff 7f and $0x7fffffff,%ebx 14: 31 ff xor %edi,%edi 16: 89 de mov %ebx,%esi 18: 0f 1f 44 00 00 nopl 0x0(%rax,%rax,1) 1d: 85 db test %ebx,%ebx 1f: 74 11 je 0x32 21: 0f 1f 44 00 00 nopl 0x0(%rax,%rax,1) 26: 44 89 e0 mov %r12d,%eax 29: 5b pop %rbx * 2a: 5d pop %rbp <-- trapping instruction 2b: 41 5c pop %r12 2d: 41 5d pop %r13 2f: 41 5e pop %r14 31: c3 retq 32: 0f 1f 44 00 00 nopl 0x0(%rax,%rax,1) 37: 9c pushfq 38: 5b pop %rbx 39: 81 e3 00 02 00 00 and $0x200,%ebx 3f: 31 .byte 0x31
