syzbot


INFO: task hung in exfat_sync_fs

Status: upstream: reported on 2023/10/27 20:30
Reported-by: syzbot+0d1cb0a990ed164d3874@syzkaller.appspotmail.com
First crash: 468d, last: 21d
Similar bugs (3)
Kernel Title Repro Cause bisect Fix bisect Count Last Reported Patched Status
upstream INFO: task hung in exfat_sync_fs exfat C error 1859 43d 558d 26/28 upstream: reported C repro on 2023/07/29 17:40
linux-5.15 INFO: task hung in exfat_sync_fs 3 453d 548d 0/3 auto-obsoleted due to no activity on 2024/02/20 04:29
linux-5.15 INFO: task hung in exfat_sync_fs (2) origin:lts-only C 67 34d 276d 0/3 upstream: reported C repro on 2024/05/06 19:33

Sample crash report:
INFO: task syz.4.2076:13778 blocked for more than 145 seconds.
      Not tainted 6.1.124-syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz.4.2076      state:D stack:28192 pid:13778 ppid:4248   flags:0x00004004
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5241 [inline]
 __schedule+0x143f/0x4570 kernel/sched/core.c:6558
 schedule+0xbf/0x180 kernel/sched/core.c:6634
 schedule_preempt_disabled+0xf/0x20 kernel/sched/core.c:6693
 __mutex_lock_common kernel/locking/mutex.c:679 [inline]
 __mutex_lock+0x6b9/0xd80 kernel/locking/mutex.c:747
 exfat_sync_fs+0x67/0x100 fs/exfat/super.c:65
 iterate_supers+0x127/0x1e0 fs/super.c:757
 ksys_sync+0xd7/0x1c0 fs/sync.c:104
 __do_sys_sync+0xa/0x10 fs/sync.c:113
 do_syscall_x64 arch/x86/entry/common.c:51 [inline]
 do_syscall_64+0x3b/0xb0 arch/x86/entry/common.c:81
 entry_SYSCALL_64_after_hwframe+0x68/0xd2
RIP: 0033:0x7fc29a385d29
RSP: 002b:00007fc29b23d038 EFLAGS: 00000246 ORIG_RAX: 00000000000000a2
RAX: ffffffffffffffda RBX: 00007fc29a575fa0 RCX: 00007fc29a385d29
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000000
RBP: 00007fc29a575fa0 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 0000000000000001 R14: 00007fc29a575fa0 R15: 00007fff192da2c8
 </TASK>
INFO: task syz.4.2076:13782 blocked for more than 146 seconds.
      Not tainted 6.1.124-syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz.4.2076      state:D stack:28552 pid:13782 ppid:4248   flags:0x00004004
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5241 [inline]
 __schedule+0x143f/0x4570 kernel/sched/core.c:6558
 schedule+0xbf/0x180 kernel/sched/core.c:6634
 schedule_preempt_disabled+0xf/0x20 kernel/sched/core.c:6693
 __mutex_lock_common kernel/locking/mutex.c:679 [inline]
 __mutex_lock+0x6b9/0xd80 kernel/locking/mutex.c:747
 exfat_sync_fs+0x67/0x100 fs/exfat/super.c:65
 iterate_supers+0x127/0x1e0 fs/super.c:757
 ksys_sync+0xd7/0x1c0 fs/sync.c:104
 __do_sys_sync+0xa/0x10 fs/sync.c:113
 do_syscall_x64 arch/x86/entry/common.c:51 [inline]
 do_syscall_64+0x3b/0xb0 arch/x86/entry/common.c:81
 entry_SYSCALL_64_after_hwframe+0x68/0xd2
RIP: 0033:0x7fc29a385d29
RSP: 002b:00007fc29b21c038 EFLAGS: 00000246 ORIG_RAX: 00000000000000a2
RAX: ffffffffffffffda RBX: 00007fc29a576080 RCX: 00007fc29a385d29
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000000
RBP: 00007fc29a576080 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 0000000000000001 R14: 00007fc29a576080 R15: 00007fff192da2c8
 </TASK>
INFO: task syz.4.2076:13784 blocked for more than 146 seconds.
      Not tainted 6.1.124-syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz.4.2076      state:D stack:28272 pid:13784 ppid:4248   flags:0x00004004
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5241 [inline]
 __schedule+0x143f/0x4570 kernel/sched/core.c:6558
 schedule+0xbf/0x180 kernel/sched/core.c:6634
 schedule_preempt_disabled+0xf/0x20 kernel/sched/core.c:6693
 __mutex_lock_common kernel/locking/mutex.c:679 [inline]
 __mutex_lock+0x6b9/0xd80 kernel/locking/mutex.c:747
 exfat_sync_fs+0x67/0x100 fs/exfat/super.c:65
 iterate_supers+0x127/0x1e0 fs/super.c:757
 ksys_sync+0xd7/0x1c0 fs/sync.c:104
 __do_sys_sync+0xa/0x10 fs/sync.c:113
 do_syscall_x64 arch/x86/entry/common.c:51 [inline]
 do_syscall_64+0x3b/0xb0 arch/x86/entry/common.c:81
 entry_SYSCALL_64_after_hwframe+0x68/0xd2
RIP: 0033:0x7fc29a385d29
RSP: 002b:00007fc29b1fb038 EFLAGS: 00000246 ORIG_RAX: 00000000000000a2
RAX: ffffffffffffffda RBX: 00007fc29a576160 RCX: 00007fc29a385d29
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000000
RBP: 00007fc29a576160 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 0000000000000001 R14: 00007fc29a576160 R15: 00007fff192da2c8
 </TASK>
INFO: task syz.4.2076:13785 blocked for more than 147 seconds.
      Not tainted 6.1.124-syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz.4.2076      state:D stack:28552 pid:13785 ppid:4248   flags:0x00004004
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5241 [inline]
 __schedule+0x143f/0x4570 kernel/sched/core.c:6558
 schedule+0xbf/0x180 kernel/sched/core.c:6634
 schedule_preempt_disabled+0xf/0x20 kernel/sched/core.c:6693
 __mutex_lock_common kernel/locking/mutex.c:679 [inline]
 __mutex_lock+0x6b9/0xd80 kernel/locking/mutex.c:747
 exfat_sync_fs+0x67/0x100 fs/exfat/super.c:65
 iterate_supers+0x127/0x1e0 fs/super.c:757
 ksys_sync+0xd7/0x1c0 fs/sync.c:104
 __do_sys_sync+0xa/0x10 fs/sync.c:113
 do_syscall_x64 arch/x86/entry/common.c:51 [inline]
 do_syscall_64+0x3b/0xb0 arch/x86/entry/common.c:81
 entry_SYSCALL_64_after_hwframe+0x68/0xd2
RIP: 0033:0x7fc29a385d29
RSP: 002b:00007fc29b1da038 EFLAGS: 00000246 ORIG_RAX: 00000000000000a2
RAX: ffffffffffffffda RBX: 00007fc29a576240 RCX: 00007fc29a385d29
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000000
RBP: 00007fc29a576240 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 0000000000000001 R14: 00007fc29a576240 R15: 00007fff192da2c8
 </TASK>
INFO: task syz.4.2076:13787 blocked for more than 147 seconds.
      Not tainted 6.1.124-syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz.4.2076      state:D stack:28552 pid:13787 ppid:4248   flags:0x00004004
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5241 [inline]
 __schedule+0x143f/0x4570 kernel/sched/core.c:6558
 schedule+0xbf/0x180 kernel/sched/core.c:6634
 schedule_preempt_disabled+0xf/0x20 kernel/sched/core.c:6693
 __mutex_lock_common kernel/locking/mutex.c:679 [inline]
 __mutex_lock+0x6b9/0xd80 kernel/locking/mutex.c:747
 exfat_sync_fs+0x67/0x100 fs/exfat/super.c:65
 iterate_supers+0x127/0x1e0 fs/super.c:757
 ksys_sync+0xd7/0x1c0 fs/sync.c:104
 __do_sys_sync+0xa/0x10 fs/sync.c:113
 do_syscall_x64 arch/x86/entry/common.c:51 [inline]
 do_syscall_64+0x3b/0xb0 arch/x86/entry/common.c:81
 entry_SYSCALL_64_after_hwframe+0x68/0xd2
RIP: 0033:0x7fc29a385d29
RSP: 002b:00007fc29b1b9038 EFLAGS: 00000246 ORIG_RAX: 00000000000000a2
RAX: ffffffffffffffda RBX: 00007fc29a576320 RCX: 00007fc29a385d29
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000000
RBP: 00007fc29a576320 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 0000000000000001 R14: 00007fc29a576320 R15: 00007fff192da2c8
 </TASK>
INFO: task syz.4.2076:13788 blocked for more than 148 seconds.
      Not tainted 6.1.124-syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz.4.2076      state:D stack:28008 pid:13788 ppid:4248   flags:0x00004004
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5241 [inline]
 __schedule+0x143f/0x4570 kernel/sched/core.c:6558
 schedule+0xbf/0x180 kernel/sched/core.c:6634
 schedule_preempt_disabled+0xf/0x20 kernel/sched/core.c:6693
 __mutex_lock_common kernel/locking/mutex.c:679 [inline]
 __mutex_lock+0x6b9/0xd80 kernel/locking/mutex.c:747
 exfat_sync_fs+0x67/0x100 fs/exfat/super.c:65
 iterate_supers+0x127/0x1e0 fs/super.c:757
 ksys_sync+0xd7/0x1c0 fs/sync.c:104
 __do_sys_sync+0xa/0x10 fs/sync.c:113
 do_syscall_x64 arch/x86/entry/common.c:51 [inline]
 do_syscall_64+0x3b/0xb0 arch/x86/entry/common.c:81
 entry_SYSCALL_64_after_hwframe+0x68/0xd2
RIP: 0033:0x7fc29a385d29
RSP: 002b:00007fc29b198038 EFLAGS: 00000246 ORIG_RAX: 00000000000000a2
RAX: ffffffffffffffda RBX: 00007fc29a576400 RCX: 00007fc29a385d29
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000000
RBP: 00007fc29a576400 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 0000000000000001 R14: 00007fc29a576400 R15: 00007fff192da2c8
 </TASK>
INFO: task syz.4.2076:13789 blocked for more than 148 seconds.
      Not tainted 6.1.124-syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz.4.2076      state:D stack:28552 pid:13789 ppid:4248   flags:0x00004004
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5241 [inline]
 __schedule+0x143f/0x4570 kernel/sched/core.c:6558
 schedule+0xbf/0x180 kernel/sched/core.c:6634
 schedule_preempt_disabled+0xf/0x20 kernel/sched/core.c:6693
 __mutex_lock_common kernel/locking/mutex.c:679 [inline]
 __mutex_lock+0x6b9/0xd80 kernel/locking/mutex.c:747
 exfat_sync_fs+0x67/0x100 fs/exfat/super.c:65
 iterate_supers+0x127/0x1e0 fs/super.c:757
 ksys_sync+0xd7/0x1c0 fs/sync.c:104
 __do_sys_sync+0xa/0x10 fs/sync.c:113
 do_syscall_x64 arch/x86/entry/common.c:51 [inline]
 do_syscall_64+0x3b/0xb0 arch/x86/entry/common.c:81
 entry_SYSCALL_64_after_hwframe+0x68/0xd2
RIP: 0033:0x7fc29a385d29
RSP: 002b:00007fc29b177038 EFLAGS: 00000246 ORIG_RAX: 00000000000000a2
RAX: ffffffffffffffda RBX: 00007fc29a5764e0 RCX: 00007fc29a385d29
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000000
RBP: 00007fc29a5764e0 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 0000000000000001 R14: 00007fc29a5764e0 R15: 00007fff192da2c8
 </TASK>
INFO: task syz.4.2076:13801 blocked for more than 148 seconds.
      Not tainted 6.1.124-syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz.4.2076      state:D stack:27288 pid:13801 ppid:4248   flags:0x00004004
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5241 [inline]
 __schedule+0x143f/0x4570 kernel/sched/core.c:6558
 schedule+0xbf/0x180 kernel/sched/core.c:6634
 schedule_preempt_disabled+0xf/0x20 kernel/sched/core.c:6693
 __mutex_lock_common kernel/locking/mutex.c:679 [inline]
 __mutex_lock+0x6b9/0xd80 kernel/locking/mutex.c:747
 exfat_sync_fs+0x67/0x100 fs/exfat/super.c:65
 iterate_supers+0x127/0x1e0 fs/super.c:757
 ksys_sync+0xd7/0x1c0 fs/sync.c:104
 __do_sys_sync+0xa/0x10 fs/sync.c:113
 do_syscall_x64 arch/x86/entry/common.c:51 [inline]
 do_syscall_64+0x3b/0xb0 arch/x86/entry/common.c:81
 entry_SYSCALL_64_after_hwframe+0x68/0xd2
RIP: 0033:0x7fc29a385d29
RSP: 002b:00007fc29b156038 EFLAGS: 00000246 ORIG_RAX: 00000000000000a2
RAX: ffffffffffffffda RBX: 00007fc29a5765c0 RCX: 00007fc29a385d29
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000000
RBP: 00007fc29a5765c0 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 0000000000000001 R14: 00007fc29a5765c0 R15: 00007fff192da2c8
 </TASK>

Showing all locks held in the system:
1 lock held by rcu_tasks_kthre/12:
 #0: ffffffff8d32b290 (rcu_tasks.tasks_gp_mutex){+.+.}-{3:3}, at: rcu_tasks_one_gp+0x29/0xe30 kernel/rcu/tasks.h:517
1 lock held by rcu_tasks_trace/13:
 #0: ffffffff8d32ba90 (rcu_tasks_trace.tasks_gp_mutex){+.+.}-{3:3}, at: rcu_tasks_one_gp+0x29/0xe30 kernel/rcu/tasks.h:517
1 lock held by khungtaskd/28:
 #0: ffffffff8d32b0c0 (rcu_read_lock){....}-{1:2}, at: rcu_lock_acquire include/linux/rcupdate.h:350 [inline]
 #0: ffffffff8d32b0c0 (rcu_read_lock){....}-{1:2}, at: rcu_read_lock include/linux/rcupdate.h:791 [inline]
 #0: ffffffff8d32b0c0 (rcu_read_lock){....}-{1:2}, at: debug_show_all_locks+0x51/0x290 kernel/locking/lockdep.c:6510
1 lock held by dhcpcd/3916:
 #0: ffffffff8e50b828 (rtnl_mutex){+.+.}-{3:3}, at: rtnl_lock net/core/rtnetlink.c:74 [inline]
 #0: ffffffff8e50b828 (rtnl_mutex){+.+.}-{3:3}, at: rtnetlink_rcv_msg+0x7c1/0xff0 net/core/rtnetlink.c:6147
2 locks held by getty/4003:
 #0: ffff88814cee4098 (&tty->ldisc_sem){++++}-{0:0}, at: tty_ldisc_ref_wait+0x21/0x70 drivers/tty/tty_ldisc.c:244
 #1: ffffc9000325e2f0 (&ldata->atomic_read_lock){+.+.}-{3:3}, at: n_tty_read+0x6a7/0x1db0 drivers/tty/n_tty.c:2198
3 locks held by kworker/1:1/9490:
 #0: ffff88802ff73d38 ((wq_completion)ipv6_addrconf){+.+.}-{0:0}, at: process_one_work+0x7a9/0x11d0 kernel/workqueue.c:2267
 #1: ffffc900050e7d20 ((work_completion)(&(&ifa->dad_work)->work)){+.+.}-{0:0}, at: process_one_work+0x7a9/0x11d0 kernel/workqueue.c:2267
 #2: ffffffff8e50b828 (rtnl_mutex){+.+.}-{3:3}, at: addrconf_dad_work+0xcc/0x16b0 net/ipv6/addrconf.c:4134
5 locks held by kworker/u4:18/12067:
3 locks held by kworker/u4:24/12081:
 #0: ffff888017c79138 ((wq_completion)events_unbound){+.+.}-{0:0}, at: process_one_work+0x7a9/0x11d0 kernel/workqueue.c:2267
 #1: ffffc90003347d20 ((linkwatch_work).work){+.+.}-{0:0}, at: process_one_work+0x7a9/0x11d0 kernel/workqueue.c:2267
 #2: ffffffff8e50b828 (rtnl_mutex){+.+.}-{3:3}, at: linkwatch_event+0xa/0x50 net/core/link_watch.c:263
6 locks held by kworker/u4:25/12083:
 #0: ffff888017e16938 ((wq_completion)netns){+.+.}-{0:0}, at: process_one_work+0x7a9/0x11d0 kernel/workqueue.c:2267
 #1: ffffc90003587d20 (net_cleanup_work){+.+.}-{0:0}, at: process_one_work+0x7a9/0x11d0 kernel/workqueue.c:2267
 #2: ffffffff8e4ff3d0 (pernet_ops_rwsem){++++}-{3:3}, at: cleanup_net+0xf1/0xbf0 net/core/net_namespace.c:583
 #3: ffffffff8e50b828 (rtnl_mutex){+.+.}-{3:3}, at: caif_exit_net+0x6a/0x4f0 net/caif/caif_dev.c:527
 #4: ffff88801ee6c280 (&caifn->caifdevs.lock){+.+.}-{3:3}, at: caif_exit_net+0x7d/0x4f0 net/caif/caif_dev.c:528
 #5: ffffffff8d3306b8 (rcu_state.exp_mutex){+.+.}-{3:3}, at: exp_funnel_lock kernel/rcu/tree_exp.h:291 [inline]
 #5: ffffffff8d3306b8 (rcu_state.exp_mutex){+.+.}-{3:3}, at: synchronize_rcu_expedited+0x4f0/0x930 kernel/rcu/tree_exp.h:962
3 locks held by kworker/u4:26/12085:
3 locks held by syz-executor/12637:
2 locks held by kworker/1:13/12996:
 #0: ffff888017c72138 ((wq_completion)rcu_gp){+.+.}-{0:0}, at: process_one_work+0x7a9/0x11d0 kernel/workqueue.c:2267
 #1: ffffc90004dffd20 ((work_completion)(&rew->rew_work)){+.+.}-{0:0}, at: process_one_work+0x7a9/0x11d0 kernel/workqueue.c:2267
3 locks held by kworker/1:15/13000:
 #0: ffff888017c70938 ((wq_completion)events){+.+.}-{0:0}, at: process_one_work+0x7a9/0x11d0 kernel/workqueue.c:2267
 #1: ffffc90004b97d20 (fqdir_free_work){+.+.}-{0:0}, at: process_one_work+0x7a9/0x11d0 kernel/workqueue.c:2267
 #2: ffffffff8d330580 (rcu_state.barrier_mutex){+.+.}-{3:3}, at: rcu_barrier+0x48/0x5f0 kernel/rcu/tree.c:4019
2 locks held by syz.4.2076/13778:
 #0: ffff8880203c20e0 (&type->s_umount_key#60){++++}-{3:3}, at: iterate_supers+0xac/0x1e0 fs/super.c:755
 #1: ffff888073b100e0 (&sbi->s_lock#3){+.+.}-{3:3}, at: exfat_sync_fs+0x67/0x100 fs/exfat/super.c:65
2 locks held by syz.4.2076/13782:
 #0: ffff8880203c20e0 (&type->s_umount_key#60){++++}-{3:3}, at: iterate_supers+0xac/0x1e0 fs/super.c:755
 #1: ffff888073b100e0 (&sbi->s_lock#3){+.+.}-{3:3}, at: exfat_sync_fs+0x67/0x100 fs/exfat/super.c:65
2 locks held by syz.4.2076/13784:
 #0: ffff8880203c20e0 (&type->s_umount_key#60){++++}-{3:3}, at: iterate_supers+0xac/0x1e0 fs/super.c:755
 #1: ffff888073b100e0 (&sbi->s_lock#3){+.+.}-{3:3}, at: exfat_sync_fs+0x67/0x100 fs/exfat/super.c:65
2 locks held by syz.4.2076/13785:
 #0: ffff8880203c20e0 (&type->s_umount_key#60){++++}-{3:3}, at: iterate_supers+0xac/0x1e0 fs/super.c:755
 #1: ffff888073b100e0 (&sbi->s_lock#3){+.+.}-{3:3}, at: exfat_sync_fs+0x67/0x100 fs/exfat/super.c:65
2 locks held by syz.4.2076/13787:
 #0: ffff8880203c20e0 (&type->s_umount_key#60){++++}-{3:3}, at: iterate_supers+0xac/0x1e0 fs/super.c:755
 #1: ffff888073b100e0 (&sbi->s_lock#3){+.+.}-{3:3}, at: exfat_sync_fs+0x67/0x100 fs/exfat/super.c:65
2 locks held by syz.4.2076/13788:
 #0: ffff8880203c20e0 (&type->s_umount_key#60){++++}-{3:3}, at: iterate_supers+0xac/0x1e0 fs/super.c:755
 #1: ffff888073b100e0 (&sbi->s_lock#3){+.+.}-{3:3}, at: exfat_sync_fs+0x67/0x100 fs/exfat/super.c:65
2 locks held by syz.4.2076/13789:
 #0: ffff8880203c20e0 (&type->s_umount_key#60){++++}-{3:3}, at: iterate_supers+0xac/0x1e0 fs/super.c:755
 #1: ffff888073b100e0 (&sbi->s_lock#3){+.+.}-{3:3}, at: exfat_sync_fs+0x67/0x100 fs/exfat/super.c:65
2 locks held by syz.4.2076/13801:
 #0: ffff8880203c20e0 (&type->s_umount_key#60){++++}-{3:3}, at: iterate_supers+0xac/0x1e0 fs/super.c:755
 #1: ffff888073b100e0 (&sbi->s_lock#3){+.+.}-{3:3}, at: exfat_sync_fs+0x67/0x100 fs/exfat/super.c:65
1 lock held by syz-executor/14798:
 #0: ffffffff8e50b828 (rtnl_mutex){+.+.}-{3:3}, at: rtnl_lock net/core/rtnetlink.c:74 [inline]
 #0: ffffffff8e50b828 (rtnl_mutex){+.+.}-{3:3}, at: rtnetlink_rcv_msg+0x7c1/0xff0 net/core/rtnetlink.c:6147
3 locks held by kworker/0:16/14959:
 #0: ffff88802ff73d38 ((wq_completion)ipv6_addrconf){+.+.}-{0:0}, at: process_one_work+0x7a9/0x11d0 kernel/workqueue.c:2267
 #1: ffffc90003937d20 ((work_completion)(&(&ifa->dad_work)->work)){+.+.}-{0:0}, at: process_one_work+0x7a9/0x11d0 kernel/workqueue.c:2267
 #2: ffffffff8e50b828 (rtnl_mutex){+.+.}-{3:3}, at: addrconf_dad_work+0xcc/0x16b0 net/ipv6/addrconf.c:4134
1 lock held by syz-executor/15033:
 #0: ffffffff8e50b828 (rtnl_mutex){+.+.}-{3:3}, at: rtnl_lock net/core/rtnetlink.c:74 [inline]
 #0: ffffffff8e50b828 (rtnl_mutex){+.+.}-{3:3}, at: rtnetlink_rcv_msg+0x7c1/0xff0 net/core/rtnetlink.c:6147

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

NMI backtrace for cpu 1
CPU: 1 PID: 28 Comm: khungtaskd Not tainted 6.1.124-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 09/13/2024
Call Trace:
 <TASK>
 __dump_stack lib/dump_stack.c:88 [inline]
 dump_stack_lvl+0x1e3/0x2cb lib/dump_stack.c:106
 nmi_cpu_backtrace+0x4e1/0x560 lib/nmi_backtrace.c:111
 nmi_trigger_cpumask_backtrace+0x1ae/0x3f0 lib/nmi_backtrace.c:62
 trigger_all_cpu_backtrace include/linux/nmi.h:148 [inline]
 check_hung_uninterruptible_tasks kernel/hung_task.c:220 [inline]
 watchdog+0xf88/0xfd0 kernel/hung_task.c:377
 kthread+0x28d/0x320 kernel/kthread.c:376
 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:295
 </TASK>
Sending NMI from CPU 1 to CPUs 0:
NMI backtrace for cpu 0
CPU: 0 PID: 12637 Comm: syz-executor Not tainted 6.1.124-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 09/13/2024
RIP: 0010:check_kcov_mode kernel/kcov.c:184 [inline]
RIP: 0010:write_comp_data kernel/kcov.c:245 [inline]
RIP: 0010:__sanitizer_cov_trace_const_cmp8+0x2a/0x80 kernel/kcov.c:320
Code: 4c 8b 04 24 65 48 8b 0d 54 cf 77 7e 65 8b 05 55 cf 77 7e 25 00 01 ff 00 74 10 3d 00 01 00 00 75 57 83 b9 1c 16 00 00 00 74 4e <8b> 81 f8 15 00 00 83 f8 03 75 43 48 8b 91 00 16 00 00 44 8b 89 fc
RSP: 0018:ffffc900035374b8 EFLAGS: 00000246
RAX: 0000000000000000 RBX: 0000018000000000 RCX: ffff888074f80000
RDX: 0000000000000000 RSI: 0000018000000000 RDI: 0000018000000000
RBP: ffffc90003537590 R08: ffffffff81bc4b1c R09: fffff94000297259
R10: 0000000000000000 R11: dffffc0000000001 R12: 1ffffd4000297258
R13: 00fff58000002052 R14: 0000018000000000 R15: ffffea00014b92c8
FS:  000055556a812500(0000) GS:ffff8880b8e00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f8613547ab8 CR3: 000000005f9d4000 CR4: 00000000003506f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 <NMI>
 </NMI>
 <TASK>
 folio_inc_refs mm/swap.c:444 [inline]
 folio_mark_accessed+0x35c/0x1c90 mm/swap.c:470
 __find_get_block+0x2c8/0x1120 fs/buffer.c:1311
 __getblk_gfp+0x2d/0xa20 fs/buffer.c:1329
 __bread_gfp+0x2a/0x370 fs/buffer.c:1367
 sb_bread include/linux/buffer_head.h:338 [inline]
 __exfat_ent_get fs/exfat/fatent.c:48 [inline]
 exfat_ent_get+0x149/0x400 fs/exfat/fatent.c:97
 exfat_readdir fs/exfat/dir.c:183 [inline]
 exfat_iterate+0xcc9/0x3270 fs/exfat/dir.c:257
 iterate_dir+0x224/0x560
 __do_sys_getdents64 fs/readdir.c:369 [inline]
 __se_sys_getdents64+0x209/0x4f0 fs/readdir.c:354
 do_syscall_x64 arch/x86/entry/common.c:51 [inline]
 do_syscall_64+0x3b/0xb0 arch/x86/entry/common.c:81
 entry_SYSCALL_64_after_hwframe+0x68/0xd2
RIP: 0033:0x7f6f1a3b8693
Code: c1 66 0f 1f 44 00 00 48 83 c4 08 48 89 ef 5b 5d e9 82 3e f8 ff 66 90 b8 ff ff ff 7f 48 39 c2 48 0f 47 d0 b8 d9 00 00 00 0f 05 <48> 3d 00 f0 ff ff 77 05 c3 0f 1f 40 00 48 c7 c2 a8 ff ff ff f7 d8
RSP: 002b:00007fff67968848 EFLAGS: 00000293 ORIG_RAX: 00000000000000d9
RAX: ffffffffffffffda RBX: 000055556a82d600 RCX: 00007f6f1a3b8693
RDX: 0000000000008000 RSI: 000055556a82d600 RDI: 0000000000000005
RBP: 000055556a82d5d4 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000001000 R11: 0000000000000293 R12: ffffffffffffffa8
R13: 0000000000000010 R14: 000055556a82d5d0 R15: 0000000000000019
 </TASK>

Crashes (95):
Time Kernel Commit Syzkaller Config Log Report Syz repro C repro VM info Assets (help?) Manager Title
2025/01/17 01:28 linux-6.1.y c63962be84ef f9e07a6e .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan INFO: task hung in exfat_sync_fs
2025/01/15 13:09 linux-6.1.y c63962be84ef 7315a7cf .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan INFO: task hung in exfat_sync_fs
2025/01/08 10:59 linux-6.1.y 7dc732d24ff7 f3558dbf .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan INFO: task hung in exfat_sync_fs
2024/10/03 09:03 linux-6.1.y aa4cd140bba5 a4c7fd36 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan INFO: task hung in exfat_sync_fs
2024/10/02 17:52 linux-6.1.y aa4cd140bba5 02f9582a .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan INFO: task hung in exfat_sync_fs
2024/10/01 17:49 linux-6.1.y aa4cd140bba5 ea2b66a6 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan INFO: task hung in exfat_sync_fs
2024/09/28 16:31 linux-6.1.y e526b12bf916 ba29ff75 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan INFO: task hung in exfat_sync_fs
2024/09/28 00:12 linux-6.1.y e526b12bf916 440b26ec .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan INFO: task hung in exfat_sync_fs
2024/09/26 22:40 linux-6.1.y e526b12bf916 9314348a .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan INFO: task hung in exfat_sync_fs
2024/09/26 02:48 linux-6.1.y e526b12bf916 0d19f247 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan INFO: task hung in exfat_sync_fs
2024/09/20 06:24 linux-6.1.y e526b12bf916 6f888b75 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan INFO: task hung in exfat_sync_fs
2024/09/19 01:26 linux-6.1.y e526b12bf916 c673ca06 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan INFO: task hung in exfat_sync_fs
2024/09/17 08:33 linux-6.1.y 5f55cad62cc9 c673ca06 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan INFO: task hung in exfat_sync_fs
2024/09/10 00:45 linux-6.1.y 5ca5b389fddf 073f8be2 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan INFO: task hung in exfat_sync_fs
2024/09/05 05:22 linux-6.1.y 699506173494 dfbe2ed4 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan INFO: task hung in exfat_sync_fs
2024/09/05 03:59 linux-6.1.y 699506173494 dfbe2ed4 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan INFO: task hung in exfat_sync_fs
2024/09/03 06:34 linux-6.1.y 311d8503ef9f 8045124c .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan INFO: task hung in exfat_sync_fs
2024/08/31 04:48 linux-6.1.y 311d8503ef9f 1eda0d14 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan INFO: task hung in exfat_sync_fs
2024/08/30 14:32 linux-6.1.y 311d8503ef9f ee2602b8 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan INFO: task hung in exfat_sync_fs
2024/08/29 22:08 linux-6.1.y ee5e09825b81 9bd464fc .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan INFO: task hung in exfat_sync_fs
2024/08/29 22:06 linux-6.1.y ee5e09825b81 9bd464fc .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan INFO: task hung in exfat_sync_fs
2024/08/28 22:40 linux-6.1.y ee5e09825b81 ef3de9e8 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan INFO: task hung in exfat_sync_fs
2024/08/28 02:18 linux-6.1.y ee5e09825b81 6c853ff9 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan INFO: task hung in exfat_sync_fs
2024/08/23 08:28 linux-6.1.y ee5e09825b81 ce8a9099 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan INFO: task hung in exfat_sync_fs
2024/08/21 20:38 linux-6.1.y ee5e09825b81 db5852f9 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan INFO: task hung in exfat_sync_fs
2024/08/19 18:37 linux-6.1.y ee5e09825b81 9f0ab3fb .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan INFO: task hung in exfat_sync_fs
2024/08/17 09:04 linux-6.1.y 117ac406ba90 dbc93b08 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan INFO: task hung in exfat_sync_fs
2024/08/16 18:02 linux-6.1.y 117ac406ba90 e1c76ab2 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan INFO: task hung in exfat_sync_fs
2024/08/15 12:47 linux-6.1.y 117ac406ba90 e4bacdaf .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan INFO: task hung in exfat_sync_fs
2024/08/14 22:32 linux-6.1.y 117ac406ba90 e6b88e20 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan INFO: task hung in exfat_sync_fs
2024/08/13 18:48 linux-6.1.y 36790ef5e00b f21a18ca .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan INFO: task hung in exfat_sync_fs
2024/08/13 05:58 linux-6.1.y 36790ef5e00b 7b0f4b46 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan INFO: task hung in exfat_sync_fs
2024/08/11 20:55 linux-6.1.y 36790ef5e00b 6f4edef4 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan INFO: task hung in exfat_sync_fs
2024/08/11 20:54 linux-6.1.y 36790ef5e00b 6f4edef4 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan INFO: task hung in exfat_sync_fs
2024/08/10 10:56 linux-6.1.y 48d525b0e463 6f4edef4 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan INFO: task hung in exfat_sync_fs
2024/08/09 14:14 linux-6.1.y 48d525b0e463 a83d9288 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan INFO: task hung in exfat_sync_fs
2024/08/09 14:08 linux-6.1.y 48d525b0e463 a83d9288 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan INFO: task hung in exfat_sync_fs
2024/08/08 06:52 linux-6.1.y 48d525b0e463 de12cf65 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan INFO: task hung in exfat_sync_fs
2024/08/08 06:43 linux-6.1.y 48d525b0e463 de12cf65 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan INFO: task hung in exfat_sync_fs
2024/08/07 15:27 linux-6.1.y 48d525b0e463 109d2082 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan INFO: task hung in exfat_sync_fs
2024/08/06 20:52 linux-6.1.y 48d525b0e463 1ef9fe42 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan INFO: task hung in exfat_sync_fs
2024/08/06 20:51 linux-6.1.y 48d525b0e463 1ef9fe42 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan INFO: task hung in exfat_sync_fs
2025/01/12 10:21 linux-6.1.y c63962be84ef 6dbc6a9b .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan-arm64 INFO: task hung in exfat_sync_fs
2025/01/07 09:12 linux-6.1.y 7dc732d24ff7 f3558dbf .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan-arm64 INFO: task hung in exfat_sync_fs
2024/12/05 18:12 linux-6.1.y e4d90d63d385 29f61fce .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan-arm64 INFO: task hung in exfat_sync_fs
2024/08/11 06:25 linux-6.1.y 48d525b0e463 6f4edef4 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan-arm64 INFO: task hung in exfat_sync_fs
2023/10/27 20:29 linux-6.1.y 32c9cdbe383c 3c418d72 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan-arm64 INFO: task hung in exfat_sync_fs
* Struck through repros no longer work on HEAD.