syzbot


INFO: task hung in __sync_dirty_buffer

Status: upstream: reported C repro on 2021/09/01 20:17
Reported-by: syzbot+91dccab7c64e2850a4e5@syzkaller.appspotmail.com
First crash: 404d, last: 10h57m

Cause bisection: the issue happens on the oldest tested release (bisect log)
Crash: INFO: task hung in __sync_dirty_buffer (log)
Repro: C syz .config

Fix bisection: failed (bisect log)
similar bugs (2):
Kernel Title Repro Cause bisect Fix bisect Count Last Reported Patched Status
linux-4.14 INFO: task hung in __sync_dirty_buffer C 5 42d 737d 0/1 upstream: reported C repro on 2020/09/29 05:34
linux-4.19 INFO: task hung in __sync_dirty_buffer C error 7 103d 725d 0/1 upstream: reported C repro on 2020/10/11 09:03

Sample crash report:
INFO: task syz-executor342:3613 blocked for more than 143 seconds.
      Not tainted 6.0.0-rc7-syzkaller-00068-g49c13ed0316d #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz-executor342 state:D stack:24840 pid: 3613 ppid:  3612 flags:0x00004004
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5182 [inline]
 __schedule+0xadf/0x52b0 kernel/sched/core.c:6494
 schedule+0xda/0x1b0 kernel/sched/core.c:6570
 io_schedule+0xba/0x130 kernel/sched/core.c:8714
 bit_wait_io+0x12/0xe0 kernel/sched/wait_bit.c:209
 __wait_on_bit_lock+0x11b/0x1a0 kernel/sched/wait_bit.c:90
 out_of_line_wait_on_bit_lock+0xd5/0x110 kernel/sched/wait_bit.c:117
 wait_on_bit_lock_io include/linux/wait_bit.h:208 [inline]
 __lock_buffer fs/buffer.c:69 [inline]
 lock_buffer include/linux/buffer_head.h:404 [inline]
 __sync_dirty_buffer+0x319/0x380 fs/buffer.c:2807
 __ext4_handle_dirty_metadata+0x2b3/0x6e0 fs/ext4/ext4_jbd2.c:381
 ext4_convert_inline_data_nolock+0x6e6/0xf10 fs/ext4/inline.c:1256
 ext4_convert_inline_data+0x513/0x5f0 fs/ext4/inline.c:2067
 ext4_fallocate+0x19b/0x4020 fs/ext4/extents.c:4701
 vfs_fallocate+0x487/0xe00 fs/open.c:323
 ioctl_preallocate+0x18e/0x200 fs/ioctl.c:290
 file_ioctl fs/ioctl.c:330 [inline]
 do_vfs_ioctl+0x1135/0x15c0 fs/ioctl.c:849
 __do_sys_ioctl fs/ioctl.c:868 [inline]
 __se_sys_ioctl fs/ioctl.c:856 [inline]
 __x64_sys_ioctl+0x108/0x200 fs/ioctl.c:856
 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+0x63/0xcd
RIP: 0033:0x7f65deadc9c9
RSP: 002b:00007fff6aca4888 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
RAX: ffffffffffffffda RBX: 0030656c69662f2e RCX: 00007f65deadc9c9
RDX: 0000000020000140 RSI: 0000000040305828 RDI: 0000000000000003
RBP: 0000000000000000 R08: 000000000000000d R09: 000000000000000d
R10: 000000000000000d R11: 0000000000000246 R12: 00007f65dea9bba0
R13: 00007fff6aca48b0 R14: 00007fff6aca489c R15: 00007fff6aca48a0
 </TASK>
INFO: task syz-executor342:3614 blocked for more than 143 seconds.
      Not tainted 6.0.0-rc7-syzkaller-00068-g49c13ed0316d #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz-executor342 state:D stack:28008 pid: 3614 ppid:  3609 flags:0x00004004
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5182 [inline]
 __schedule+0xadf/0x52b0 kernel/sched/core.c:6494
 schedule+0xda/0x1b0 kernel/sched/core.c:6570
 rwsem_down_write_slowpath+0x59c/0x11e0 kernel/locking/rwsem.c:1182
 __down_write_common kernel/locking/rwsem.c:1297 [inline]
 __down_write_common kernel/locking/rwsem.c:1294 [inline]
 __down_write kernel/locking/rwsem.c:1306 [inline]
 down_write+0x135/0x150 kernel/locking/rwsem.c:1553
 inode_lock include/linux/fs.h:756 [inline]
 do_truncate+0x12a/0x200 fs/open.c:63
 vfs_truncate+0x3db/0x4c0 fs/open.c:111
 do_sys_truncate.part.0+0x11e/0x140 fs/open.c:134
 do_sys_truncate fs/open.c:128 [inline]
 __do_sys_truncate fs/open.c:146 [inline]
 __se_sys_truncate fs/open.c:144 [inline]
 __x64_sys_truncate+0x69/0x90 fs/open.c:144
 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+0x63/0xcd
RIP: 0033:0x7f65deadc9c9
RSP: 002b:00007fff6aca4888 EFLAGS: 00000246 ORIG_RAX: 000000000000004c
RAX: ffffffffffffffda RBX: 0030656c69662f2e RCX: 00007f65deadc9c9
RDX: ffffffffffffffc0 RSI: 0000000000000006 RDI: 00000000200003c0
RBP: 0000000000000000 R08: 000000000000000d R09: 000000000000000d
R10: 000000000000000d R11: 0000000000000246 R12: 00007f65dea9bba0
R13: 00007fff6aca48b0 R14: 00007fff6aca489c R15: 00007fff6aca48a0
 </TASK>
INFO: task syz-executor342:3617 blocked for more than 143 seconds.
      Not tainted 6.0.0-rc7-syzkaller-00068-g49c13ed0316d #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz-executor342 state:D stack:25280 pid: 3617 ppid:  3608 flags:0x00004004
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5182 [inline]
 __schedule+0xadf/0x52b0 kernel/sched/core.c:6494
 schedule+0xda/0x1b0 kernel/sched/core.c:6570
 io_schedule+0xba/0x130 kernel/sched/core.c:8714
 bit_wait_io+0x12/0xe0 kernel/sched/wait_bit.c:209
 __wait_on_bit_lock+0x11b/0x1a0 kernel/sched/wait_bit.c:90
 out_of_line_wait_on_bit_lock+0xd5/0x110 kernel/sched/wait_bit.c:117
 wait_on_bit_lock_io include/linux/wait_bit.h:208 [inline]
 __lock_buffer fs/buffer.c:69 [inline]
 lock_buffer include/linux/buffer_head.h:404 [inline]
 __sync_dirty_buffer+0x319/0x380 fs/buffer.c:2807
 __ext4_handle_dirty_metadata+0x2b3/0x6e0 fs/ext4/ext4_jbd2.c:381
 ext4_convert_inline_data_nolock+0x6e6/0xf10 fs/ext4/inline.c:1256
 ext4_convert_inline_data+0x513/0x5f0 fs/ext4/inline.c:2067
 ext4_fallocate+0x19b/0x4020 fs/ext4/extents.c:4701
 vfs_fallocate+0x487/0xe00 fs/open.c:323
 ioctl_preallocate+0x18e/0x200 fs/ioctl.c:290
 file_ioctl fs/ioctl.c:330 [inline]
 do_vfs_ioctl+0x1135/0x15c0 fs/ioctl.c:849
 __do_sys_ioctl fs/ioctl.c:868 [inline]
 __se_sys_ioctl fs/ioctl.c:856 [inline]
 __x64_sys_ioctl+0x108/0x200 fs/ioctl.c:856
 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+0x63/0xcd
RIP: 0033:0x7f65deadc9c9
RSP: 002b:00007fff6aca4888 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
RAX: ffffffffffffffda RBX: 0030656c69662f2e RCX: 00007f65deadc9c9
RDX: 0000000020000140 RSI: 0000000040305828 RDI: 0000000000000003
RBP: 0000000000000000 R08: 000000000000000d R09: 000000000000000d
R10: 000000000000000d R11: 0000000000000246 R12: 00007f65dea9bba0
R13: 00007fff6aca48b0 R14: 00007fff6aca489c R15: 00007fff6aca48a0
 </TASK>
INFO: task syz-executor342:3618 blocked for more than 144 seconds.
      Not tainted 6.0.0-rc7-syzkaller-00068-g49c13ed0316d #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz-executor342 state:D stack:25344 pid: 3618 ppid:  3610 flags:0x00004004
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5182 [inline]
 __schedule+0xadf/0x52b0 kernel/sched/core.c:6494
 schedule+0xda/0x1b0 kernel/sched/core.c:6570
 io_schedule+0xba/0x130 kernel/sched/core.c:8714
 bit_wait_io+0x12/0xe0 kernel/sched/wait_bit.c:209
 __wait_on_bit_lock+0x11b/0x1a0 kernel/sched/wait_bit.c:90
 out_of_line_wait_on_bit_lock+0xd5/0x110 kernel/sched/wait_bit.c:117
 wait_on_bit_lock_io include/linux/wait_bit.h:208 [inline]
 __lock_buffer fs/buffer.c:69 [inline]
 lock_buffer include/linux/buffer_head.h:404 [inline]
 __sync_dirty_buffer+0x319/0x380 fs/buffer.c:2807
 __ext4_handle_dirty_metadata+0x2b3/0x6e0 fs/ext4/ext4_jbd2.c:381
 ext4_convert_inline_data_nolock+0x6e6/0xf10 fs/ext4/inline.c:1256
 ext4_convert_inline_data+0x513/0x5f0 fs/ext4/inline.c:2067
 ext4_fallocate+0x19b/0x4020 fs/ext4/extents.c:4701
 vfs_fallocate+0x487/0xe00 fs/open.c:323
 ioctl_preallocate+0x18e/0x200 fs/ioctl.c:290
 file_ioctl fs/ioctl.c:330 [inline]
 do_vfs_ioctl+0x1135/0x15c0 fs/ioctl.c:849
 __do_sys_ioctl fs/ioctl.c:868 [inline]
 __se_sys_ioctl fs/ioctl.c:856 [inline]
 __x64_sys_ioctl+0x108/0x200 fs/ioctl.c:856
 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+0x63/0xcd
RIP: 0033:0x7f65deadc9c9
RSP: 002b:00007fff6aca4888 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
RAX: ffffffffffffffda RBX: 0030656c69662f2e RCX: 00007f65deadc9c9
RDX: 0000000020000140 RSI: 0000000040305828 RDI: 0000000000000003
RBP: 0000000000000000 R08: 000000000000000d R09: 000000000000000d
R10: 000000000000000d R11: 0000000000000246 R12: 00007f65dea9bba0
R13: 00007fff6aca48b0 R14: 00007fff6aca489c R15: 00007fff6aca48a0
 </TASK>
INFO: task syz-executor342:3630 blocked for more than 144 seconds.
      Not tainted 6.0.0-rc7-syzkaller-00068-g49c13ed0316d #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz-executor342 state:D stack:28376 pid: 3630 ppid:  3611 flags:0x00004004
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5182 [inline]
 __schedule+0xadf/0x52b0 kernel/sched/core.c:6494
 schedule+0xda/0x1b0 kernel/sched/core.c:6570
 rwsem_down_write_slowpath+0x59c/0x11e0 kernel/locking/rwsem.c:1182
 __down_write_common kernel/locking/rwsem.c:1297 [inline]
 __down_write_common kernel/locking/rwsem.c:1294 [inline]
 __down_write kernel/locking/rwsem.c:1306 [inline]
 down_write+0x135/0x150 kernel/locking/rwsem.c:1553
 inode_lock include/linux/fs.h:756 [inline]
 do_truncate+0x12a/0x200 fs/open.c:63
 vfs_truncate+0x3db/0x4c0 fs/open.c:111
 do_sys_truncate.part.0+0x11e/0x140 fs/open.c:134
 do_sys_truncate fs/open.c:128 [inline]
 __do_sys_truncate fs/open.c:146 [inline]
 __se_sys_truncate fs/open.c:144 [inline]
 __x64_sys_truncate+0x69/0x90 fs/open.c:144
 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+0x63/0xcd
RIP: 0033:0x7f65deadc9c9
RSP: 002b:00007fff6aca4888 EFLAGS: 00000246 ORIG_RAX: 000000000000004c
RAX: ffffffffffffffda RBX: 0030656c69662f2e RCX: 00007f65deadc9c9
RDX: ffffffffffffffc0 RSI: 0000000000000006 RDI: 00000000200003c0
RBP: 0000000000000000 R08: 000000000000000d R09: 000000000000000d
R10: 000000000000000d R11: 0000000000000246 R12: 000000000000c205
R13: 00007fff6aca48b0 R14: 00007fff6aca489c R15: 00007fff6aca48a0
 </TASK>
INFO: task syz-executor342:3631 blocked for more than 144 seconds.
      Not tainted 6.0.0-rc7-syzkaller-00068-g49c13ed0316d #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz-executor342 state:D stack:28376 pid: 3631 ppid:  3607 flags:0x00004004
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5182 [inline]
 __schedule+0xadf/0x52b0 kernel/sched/core.c:6494
 schedule+0xda/0x1b0 kernel/sched/core.c:6570
 rwsem_down_write_slowpath+0x59c/0x11e0 kernel/locking/rwsem.c:1182
 __down_write_common kernel/locking/rwsem.c:1297 [inline]
 __down_write_common kernel/locking/rwsem.c:1294 [inline]
 __down_write kernel/locking/rwsem.c:1306 [inline]
 down_write+0x135/0x150 kernel/locking/rwsem.c:1553
 inode_lock include/linux/fs.h:756 [inline]
 do_truncate+0x12a/0x200 fs/open.c:63
 vfs_truncate+0x3db/0x4c0 fs/open.c:111
 do_sys_truncate.part.0+0x11e/0x140 fs/open.c:134
 do_sys_truncate fs/open.c:128 [inline]
 __do_sys_truncate fs/open.c:146 [inline]
 __se_sys_truncate fs/open.c:144 [inline]
 __x64_sys_truncate+0x69/0x90 fs/open.c:144
 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+0x63/0xcd
RIP: 0033:0x7f65deadc9c9
RSP: 002b:00007fff6aca4888 EFLAGS: 00000246 ORIG_RAX: 000000000000004c
RAX: ffffffffffffffda RBX: 0030656c69662f2e RCX: 00007f65deadc9c9
RDX: ffffffffffffffc0 RSI: 0000000000000006 RDI: 00000000200003c0
RBP: 0000000000000000 R08: 000000000000000d R09: 000000000000000d
R10: 000000000000000d R11: 0000000000000246 R12: 000000000000c104
R13: 00007fff6aca48b0 R14: 00007fff6aca489c R15: 00007fff6aca48a0
 </TASK>

Showing all locks held in the system:
1 lock held by rcu_tasks_kthre/12:
 #0: ffffffff8bf85db0 (rcu_tasks.tasks_gp_mutex){+.+.}-{3:3}, at: rcu_tasks_one_gp+0x26/0xc70 kernel/rcu/tasks.h:507
1 lock held by rcu_tasks_trace/13:
 #0: ffffffff8bf85ab0 (rcu_tasks_trace.tasks_gp_mutex){+.+.}-{3:3}, at: rcu_tasks_one_gp+0x26/0xc70 kernel/rcu/tasks.h:507
1 lock held by khungtaskd/28:
 #0: ffffffff8bf86900 (rcu_read_lock){....}-{1:2}, at: debug_show_all_locks+0x53/0x260 kernel/locking/lockdep.c:6492
2 locks held by getty/3287:
 #0: ffff88814b05e098 (&tty->ldisc_sem){++++}-{0:0}, at: tty_ldisc_ref_wait+0x22/0x80 drivers/tty/tty_ldisc.c:244
 #1: ffffc90001c282f0 (&ldata->atomic_read_lock){+.+.}-{3:3}, at: n_tty_read+0xef0/0x13e0 drivers/tty/n_tty.c:2177
3 locks held by syz-executor342/3613:
 #0: ffff888071c98460 (sb_writers#5){.+.+}-{0:0}, at: ioctl_preallocate+0x18e/0x200 fs/ioctl.c:290
 #1: ffff88806b8ae600 (&sb->s_type->i_mutex_key#7){++++}-{3:3}, at: inode_lock include/linux/fs.h:756 [inline]
 #1: ffff88806b8ae600 (&sb->s_type->i_mutex_key#7){++++}-{3:3}, at: ext4_fallocate+0x193/0x4020 fs/ext4/extents.c:4700
 #2: ffff88806b8ae2c8 (&ei->xattr_sem){++++}-{3:3}, at: ext4_write_lock_xattr fs/ext4/xattr.h:155 [inline]
 #2: ffff88806b8ae2c8 (&ei->xattr_sem){++++}-{3:3}, at: ext4_convert_inline_data+0x34b/0x5f0 fs/ext4/inline.c:2065
2 locks held by syz-executor342/3614:
 #0: ffff888072536460 (sb_writers#5){.+.+}-{0:0}, at: vfs_truncate+0xea/0x4c0 fs/open.c:84
 #1: ffff88806b894740 (&sb->s_type->i_mutex_key#7){++++}-{3:3}, at: inode_lock include/linux/fs.h:756 [inline]
 #1: ffff88806b894740 (&sb->s_type->i_mutex_key#7){++++}-{3:3}, at: do_truncate+0x12a/0x200 fs/open.c:63
3 locks held by syz-executor342/3617:
 #0: ffff888072536460 (sb_writers#5){.+.+}-{0:0}, at: ioctl_preallocate+0x18e/0x200 fs/ioctl.c:290
 #1: ffff88806b894740 (&sb->s_type->i_mutex_key#7){++++}-{3:3}, at: inode_lock include/linux/fs.h:756 [inline]
 #1: ffff88806b894740 (&sb->s_type->i_mutex_key#7){++++}-{3:3}, at: ext4_fallocate+0x193/0x4020 fs/ext4/extents.c:4700
 #2: ffff88806b894408 (&ei->xattr_sem){++++}-{3:3}, at: ext4_write_lock_xattr fs/ext4/xattr.h:155 [inline]
 #2: ffff88806b894408 (&ei->xattr_sem){++++}-{3:3}, at: ext4_convert_inline_data+0x34b/0x5f0 fs/ext4/inline.c:2065
3 locks held by syz-executor342/3618:
 #0: ffff88807ca5a460 (sb_writers#5){.+.+}-{0:0}, at: ioctl_preallocate+0x18e/0x200 fs/ioctl.c:290
 #1: ffff88806b89a800 (&sb->s_type->i_mutex_key#7){++++}-{3:3}, at: inode_lock include/linux/fs.h:756 [inline]
 #1: ffff88806b89a800 (&sb->s_type->i_mutex_key#7){++++}-{3:3}, at: ext4_fallocate+0x193/0x4020 fs/ext4/extents.c:4700
 #2: ffff88806b89a4c8 (&ei->xattr_sem){++++}-{3:3}, at: ext4_write_lock_xattr fs/ext4/xattr.h:155 [inline]
 #2: ffff88806b89a4c8 (&ei->xattr_sem){++++}-{3:3}, at: ext4_convert_inline_data+0x34b/0x5f0 fs/ext4/inline.c:2065
2 locks held by syz-executor342/3630:
 #0: ffff88807ca5a460 (sb_writers#5){.+.+}-{0:0}, at: vfs_truncate+0xea/0x4c0 fs/open.c:84
 #1: ffff88806b89a800 (&sb->s_type->i_mutex_key#7){++++}-{3:3}, at: inode_lock include/linux/fs.h:756 [inline]
 #1: ffff88806b89a800 (&sb->s_type->i_mutex_key#7){++++}-{3:3}, at: do_truncate+0x12a/0x200 fs/open.c:63
2 locks held by syz-executor342/3631:
 #0: ffff88807ca5a460 (sb_writers#5){.+.+}-{0:0}, at: vfs_truncate+0xea/0x4c0 fs/open.c:84
 #1: ffff88806b89a800 (&sb->s_type->i_mutex_key#7){++++}-{3:3}, at: inode_lock include/linux/fs.h:756 [inline]
 #1: ffff88806b89a800 (&sb->s_type->i_mutex_key#7){++++}-{3:3}, at: do_truncate+0x12a/0x200 fs/open.c:63

=============================================

NMI backtrace for cpu 0
CPU: 0 PID: 28 Comm: khungtaskd Not tainted 6.0.0-rc7-syzkaller-00068-g49c13ed0316d #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 08/26/2022
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+0x46/0x14f lib/nmi_backtrace.c:111
 nmi_trigger_cpumask_backtrace+0x206/0x250 lib/nmi_backtrace.c:62
 trigger_all_cpu_backtrace include/linux/nmi.h:148 [inline]
 check_hung_uninterruptible_tasks kernel/hung_task.c:212 [inline]
 watchdog+0xc18/0xf50 kernel/hung_task.c:369
 kthread+0x2e4/0x3a0 kernel/kthread.c:376
 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:306
 </TASK>
Sending NMI from CPU 0 to CPUs 1:
NMI backtrace for cpu 1
CPU: 1 PID: 1236 Comm: kworker/u4:5 Not tainted 6.0.0-rc7-syzkaller-00068-g49c13ed0316d #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 08/26/2022
Workqueue: events_unbound toggle_allocation_gate
RIP: 0010:lockdep_hardirqs_on_prepare kernel/locking/lockdep.c:4316 [inline]
RIP: 0010:lockdep_hardirqs_on_prepare+0xff/0x400 kernel/locking/lockdep.c:4271
Code: 00 0f 85 de 02 00 00 48 8d bb 50 0a 00 00 48 8b ab 68 0a 00 00 48 b8 00 00 00 00 00 fc ff df 48 89 fa 48 c1 ea 03 80 3c 02 00 <0f> 85 bf 02 00 00 48 89 ab 50 0a 00 00 48 c7 c7 c0 95 ec 89 e8 98
RSP: 0018:ffffc90004e5f9a0 EFLAGS: 00000046
RAX: dffffc0000000000 RBX: ffff888021128240 RCX: 1ffffffff1bbc251
RDX: 1ffff11004225192 RSI: 0000000000000000 RDI: ffff888021128c90
RBP: c3e80a43b67aafd8 R08: 0000000000000000 R09: 0000000000000001
R10: 0000000000000001 R11: 0000000000000000 R12: ffffffff812c573e
R13: 0000000000000004 R14: 0000000000000185 R15: ffffffff8c0c6d80
FS:  0000000000000000(0000) GS:ffff8880b9b00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 000055cded111680 CR3: 000000000bc8e000 CR4: 00000000003506e0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 <TASK>
 trace_hardirqs_on+0x2d/0x120 kernel/trace/trace_preemptirq.c:49
 __text_poke+0x64e/0x8e0 arch/x86/kernel/alternative.c:1183
 text_poke arch/x86/kernel/alternative.c:1208 [inline]
 text_poke_bp_batch+0x382/0x6c0 arch/x86/kernel/alternative.c:1503
 text_poke_flush arch/x86/kernel/alternative.c:1660 [inline]
 text_poke_flush arch/x86/kernel/alternative.c:1657 [inline]
 text_poke_finish+0x16/0x30 arch/x86/kernel/alternative.c:1667
 arch_jump_label_transform_apply+0x13/0x20 arch/x86/kernel/jump_label.c:146
 jump_label_update+0x32f/0x410 kernel/jump_label.c:801
 static_key_disable_cpuslocked+0x152/0x1b0 kernel/jump_label.c:207
 static_key_disable+0x16/0x20 kernel/jump_label.c:215
 toggle_allocation_gate mm/kfence/core.c:825 [inline]
 toggle_allocation_gate+0x183/0x390 mm/kfence/core.c:803
 process_one_work+0x991/0x1610 kernel/workqueue.c:2289
 worker_thread+0x665/0x1080 kernel/workqueue.c:2436
 kthread+0x2e4/0x3a0 kernel/kthread.c:376
 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:306
 </TASK>

Crashes (19):
Manager Time Kernel Commit Syzkaller Config Log Report Syz repro C repro VM info Title
ci-upstream-kasan-gce-selinux-root 2022/09/29 00:13 upstream 49c13ed0316d e2556bc3 .config log report syz C INFO: task hung in __sync_dirty_buffer
ci-upstream-kasan-gce-root 2022/07/06 08:48 upstream e35e5b6f695d bff65f44 .config log report syz C INFO: task hung in __sync_dirty_buffer
ci-upstream-kasan-gce-selinux-root 2022/02/26 07:00 upstream 53ab78cd6d5a 45a13a73 .config log report syz C INFO: task hung in __sync_dirty_buffer
ci-upstream-kasan-gce-root 2021/12/29 05:03 upstream ecf71de775a0 76c8cf06 .config log report syz C INFO: task hung in __sync_dirty_buffer
ci-upstream-kasan-gce-root 2021/12/25 08:18 upstream b927dfc67d05 6caa12e4 .config log report syz C INFO: task hung in __sync_dirty_buffer
ci-upstream-kasan-gce-selinux-root 2021/12/18 17:44 upstream 9eaa88c7036e 44068e19 .config log report syz C INFO: task hung in __sync_dirty_buffer
ci-upstream-kasan-gce-root 2021/08/28 20:15 upstream 64b4fc45bea6 be2c130d .config log report syz C INFO: task hung in __sync_dirty_buffer
ci-upstream-linux-next-kasan-gce-root 2022/08/20 20:37 linux-next 8755ae45a9e8 26a13b38 .config log report syz C INFO: task hung in __sync_dirty_buffer
ci-upstream-linux-next-kasan-gce-root 2022/02/06 16:20 linux-next ef6b35306dd8 a7dab638 .config log report syz C INFO: task can't die in bit_wait_io
ci-upstream-kasan-gce-smack-root 2022/10/06 13:25 upstream 833477fce7a1 131b38ac .config log report info INFO: task hung in __sync_dirty_buffer
ci2-upstream-fs 2022/10/06 00:46 upstream 2bca25eaeba6 2c6543ad .config log report info INFO: task hung in __sync_dirty_buffer
ci2-upstream-fs 2022/10/05 22:26 upstream 2bca25eaeba6 2c6543ad .config log report info INFO: task hung in __sync_dirty_buffer
ci2-upstream-fs 2022/10/02 16:03 upstream b357fd1c2afc feb56351 .config log report info INFO: task hung in __sync_dirty_buffer
ci2-upstream-fs 2022/09/29 20:38 upstream c3e0e1e23c70 45fd7169 .config log report info INFO: task hung in __sync_dirty_buffer
ci-upstream-kasan-gce-root 2022/06/13 19:47 upstream b13baccc3850 0d5abf15 .config log report info INFO: task hung in __sync_dirty_buffer
ci-upstream-linux-next-kasan-gce-root 2022/07/23 08:28 linux-next cb71b93c2dc3 22343af4 .config log report info INFO: task hung in __sync_dirty_buffer
ci-upstream-linux-next-kasan-gce-root 2021/08/31 20:01 linux-next 52c7b727581f 7eb7e152 .config log report info INFO: task hung in __sync_dirty_buffer
ci-upstream-gce-arm64 2022/10/01 14:23 git://git.kernel.org/pub/scm/linux/kernel/git/arm64/linux.git for-kernelci bbed346d5a96 feb56351 .config log report info INFO: task hung in __sync_dirty_buffer
ci-upstream-linux-next-kasan-gce-root 2022/04/15 03:46 linux-next 40354149f4d7 b17b2923 .config log report info INFO: task can't die in bit_wait_io
* Struck through repros no longer work on HEAD.