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INFO: task hung in d_alloc_parallel

Status: upstream: reported C repro on 2020/05/01 20:49
Subsystems: vfs
[Documentation on labels]
Reported-by: syzbot+a0d1743d239c1544a3f7@syzkaller.appspotmail.com
First crash: 1447d, last: 430d
Fix bisection: failed (error log, bisect log)
  
▶ ▼ Similar bugs (7)
Kernel Title Repro Cause bisect Fix bisect Count Last Reported Patched Status
android-49 INFO: task hung in d_alloc_parallel 85 1681d 1830d 0/3 auto-closed as invalid on 2020/01/08 20:52
linux-5.15 INFO: task hung in d_alloc_parallel 1 45m 45m 0/3 upstream: reported on 2024/04/18 05:41
linux-4.14 INFO: task hung in d_alloc_parallel C error 4 1100d 1709d 0/1 upstream: reported C repro on 2019/08/14 00:43
android-414 INFO: task hung in d_alloc_parallel 1 1641d 1641d 0/1 auto-closed as invalid on 2020/02/18 04:29
upstream INFO: task hung in d_alloc_parallel fuse 213 1874d 2205d 0/26 closed as dup on 2018/09/08 15:40
linux-6.1 INFO: task hung in d_alloc_parallel 1 3d02h 3d02h 0/3 upstream: reported on 2024/04/15 03:31
upstream INFO: task hung in d_alloc_parallel (2) fs C done error 245 7h34m 1639d 0/26 upstream: reported C repro on 2019/10/22 22:44
▶ ▼ Fix bisection attempts (9)
Created Duration User Patch Repo Result
2021/03/05 03:26 18m bisect fix linux-4.19.y error job log (0)
2021/01/04 05:10 34m bisect fix linux-4.19.y job log (0) log
2020/11/28 02:20 41m bisect fix linux-4.19.y job log (0) log
2020/10/29 01:42 37m bisect fix linux-4.19.y job log (0) log
2020/09/29 01:03 39m bisect fix linux-4.19.y job log (0) log
2020/08/30 00:21 41m bisect fix linux-4.19.y job log (0) log
2020/07/30 23:39 41m bisect fix linux-4.19.y job log (0) log
2020/06/30 22:50 37m bisect fix linux-4.19.y job log (0) log
2020/05/31 21:17 38m bisect fix linux-4.19.y job log (0) log

Sample crash report:
loop5: rw=0, want=5150853156, limit=272
attempt to access beyond end of device
attempt to access beyond end of device
loop5: rw=0, want=1802385994, limit=272
loop2: rw=0, want=1802385994, limit=272
INFO: task syz-executor106:8134 blocked for more than 140 seconds.
      Not tainted 4.19.211-syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
syz-executor106 D28712  8134   8107 0x00000004
Call Trace:
 context_switch kernel/sched/core.c:2828 [inline]
 __schedule+0x887/0x2040 kernel/sched/core.c:3517
 schedule+0x8d/0x1b0 kernel/sched/core.c:3561
 d_wait_lookup fs/dcache.c:2430 [inline]
 d_alloc_parallel+0x1292/0x19e0 fs/dcache.c:2512
 __lookup_slow+0x18d/0x4a0 fs/namei.c:1655
 lookup_slow fs/namei.c:1689 [inline]
 walk_component+0x7ac/0xda0 fs/namei.c:1811
 lookup_last fs/namei.c:2274 [inline]
 path_lookupat+0x1ff/0x8d0 fs/namei.c:2319
 filename_lookup+0x1ac/0x5a0 fs/namei.c:2349
 user_path include/linux/namei.h:62 [inline]
 do_mount+0x147/0x2f50 fs/namespace.c:2762
 ksys_mount+0xcf/0x130 fs/namespace.c:3038
 __do_sys_mount fs/namespace.c:3052 [inline]
 __se_sys_mount fs/namespace.c:3049 [inline]
 __x64_sys_mount+0xba/0x150 fs/namespace.c:3049
 do_syscall_64+0xf9/0x620 arch/x86/entry/common.c:293
 entry_SYSCALL_64_after_hwframe+0x49/0xbe
RIP: 0033:0x7fcb80b98c29
Code: ff ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 00 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 b8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007fcb80b242f8 EFLAGS: 00000246 ORIG_RAX: 00000000000000a5
RAX: ffffffffffffffda RBX: 00007fcb80c1d4b0 RCX: 00007fcb80b98c29
RDX: 0000000000000000 RSI: 00000000200002c0 RDI: 0000000000000000
RBP: 0030656c69662f2e R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000004 R11: 0000000000000246 R12: 00007fcb80bea0c8
R13: 00000000200011c0 R14: 000000807fffffff R15: 00007fcb80c1d4b8
INFO: task syz-executor106:8138 blocked for more than 140 seconds.
      Not tainted 4.19.211-syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
syz-executor106 D28712  8138   8105 0x00000004
Call Trace:
 context_switch kernel/sched/core.c:2828 [inline]
 __schedule+0x887/0x2040 kernel/sched/core.c:3517
 schedule+0x8d/0x1b0 kernel/sched/core.c:3561
 d_wait_lookup fs/dcache.c:2430 [inline]
 d_alloc_parallel+0x1292/0x19e0 fs/dcache.c:2512
 __lookup_slow+0x18d/0x4a0 fs/namei.c:1655
 lookup_slow fs/namei.c:1689 [inline]
 walk_component+0x7ac/0xda0 fs/namei.c:1811
 lookup_last fs/namei.c:2274 [inline]
 path_lookupat+0x1ff/0x8d0 fs/namei.c:2319
 filename_lookup+0x1ac/0x5a0 fs/namei.c:2349
 user_path include/linux/namei.h:62 [inline]
 do_mount+0x147/0x2f50 fs/namespace.c:2762
 ksys_mount+0xcf/0x130 fs/namespace.c:3038
 __do_sys_mount fs/namespace.c:3052 [inline]
 __se_sys_mount fs/namespace.c:3049 [inline]
 __x64_sys_mount+0xba/0x150 fs/namespace.c:3049
 do_syscall_64+0xf9/0x620 arch/x86/entry/common.c:293
 entry_SYSCALL_64_after_hwframe+0x49/0xbe
RIP: 0033:0x7fcb80b98c29
Code: ff ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 00 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 b8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007fcb80b242f8 EFLAGS: 00000246 ORIG_RAX: 00000000000000a5
RAX: ffffffffffffffda RBX: 00007fcb80c1d4b0 RCX: 00007fcb80b98c29
RDX: 0000000000000000 RSI: 00000000200002c0 RDI: 0000000000000000
RBP: 0030656c69662f2e R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000004 R11: 0000000000000246 R12: 00007fcb80bea0c8
R13: 00000000200011c0 R14: 000000807fffffff R15: 00007fcb80c1d4b8
INFO: task syz-executor106:8136 blocked for more than 140 seconds.
      Not tainted 4.19.211-syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
syz-executor106 D28696  8136   8103 0x00000004
Call Trace:
 context_switch kernel/sched/core.c:2828 [inline]
 __schedule+0x887/0x2040 kernel/sched/core.c:3517
 schedule+0x8d/0x1b0 kernel/sched/core.c:3561
 d_wait_lookup fs/dcache.c:2430 [inline]
 d_alloc_parallel+0x1292/0x19e0 fs/dcache.c:2512
 __lookup_slow+0x18d/0x4a0 fs/namei.c:1655
 lookup_slow fs/namei.c:1689 [inline]
 walk_component+0x7ac/0xda0 fs/namei.c:1811
 lookup_last fs/namei.c:2274 [inline]
 path_lookupat+0x1ff/0x8d0 fs/namei.c:2319
 filename_lookup+0x1ac/0x5a0 fs/namei.c:2349
 user_path include/linux/namei.h:62 [inline]
 do_mount+0x147/0x2f50 fs/namespace.c:2762
 ksys_mount+0xcf/0x130 fs/namespace.c:3038
 __do_sys_mount fs/namespace.c:3052 [inline]
 __se_sys_mount fs/namespace.c:3049 [inline]
 __x64_sys_mount+0xba/0x150 fs/namespace.c:3049
 do_syscall_64+0xf9/0x620 arch/x86/entry/common.c:293
 entry_SYSCALL_64_after_hwframe+0x49/0xbe
RIP: 0033:0x7fcb80b98c29
Code: ff ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 00 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 b8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007fcb80b242f8 EFLAGS: 00000246 ORIG_RAX: 00000000000000a5
RAX: ffffffffffffffda RBX: 00007fcb80c1d4b0 RCX: 00007fcb80b98c29
RDX: 0000000000000000 RSI: 00000000200002c0 RDI: 0000000000000000
RBP: 0030656c69662f2e R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000004 R11: 0000000000000246 R12: 00007fcb80bea0c8
R13: 00000000200011c0 R14: 000000807fffffff R15: 00007fcb80c1d4b8
INFO: task syz-executor106:8140 blocked for more than 140 seconds.
      Not tainted 4.19.211-syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
syz-executor106 D27664  8140   8102 0x00000004
Call Trace:
 context_switch kernel/sched/core.c:2828 [inline]
 __schedule+0x887/0x2040 kernel/sched/core.c:3517
 schedule+0x8d/0x1b0 kernel/sched/core.c:3561
 d_wait_lookup fs/dcache.c:2430 [inline]
 d_alloc_parallel+0x1292/0x19e0 fs/dcache.c:2512
 __lookup_slow+0x18d/0x4a0 fs/namei.c:1655
 lookup_slow fs/namei.c:1689 [inline]
 walk_component+0x7ac/0xda0 fs/namei.c:1811
 lookup_last fs/namei.c:2274 [inline]
 path_lookupat+0x1ff/0x8d0 fs/namei.c:2319
 filename_lookup+0x1ac/0x5a0 fs/namei.c:2349
 user_path include/linux/namei.h:62 [inline]
 do_mount+0x147/0x2f50 fs/namespace.c:2762
 ksys_mount+0xcf/0x130 fs/namespace.c:3038
 __do_sys_mount fs/namespace.c:3052 [inline]
 __se_sys_mount fs/namespace.c:3049 [inline]
 __x64_sys_mount+0xba/0x150 fs/namespace.c:3049
 do_syscall_64+0xf9/0x620 arch/x86/entry/common.c:293
 entry_SYSCALL_64_after_hwframe+0x49/0xbe
RIP: 0033:0x7fcb80b98c29
Code: ff ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 00 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 b8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007fcb80b242f8 EFLAGS: 00000246 ORIG_RAX: 00000000000000a5
RAX: ffffffffffffffda RBX: 00007fcb80c1d4b0 RCX: 00007fcb80b98c29
RDX: 0000000000000000 RSI: 00000000200002c0 RDI: 0000000000000000
RBP: 0030656c69662f2e R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000004 R11: 0000000000000246 R12: 00007fcb80bea0c8
R13: 00000000200011c0 R14: 000000807fffffff R15: 00007fcb80c1d4b8
INFO: task syz-executor106:8142 blocked for more than 140 seconds.
      Not tainted 4.19.211-syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
syz-executor106 D28712  8142   8106 0x00000004
Call Trace:
 context_switch kernel/sched/core.c:2828 [inline]
 __schedule+0x887/0x2040 kernel/sched/core.c:3517
 schedule+0x8d/0x1b0 kernel/sched/core.c:3561
 d_wait_lookup fs/dcache.c:2430 [inline]
 d_alloc_parallel+0x1292/0x19e0 fs/dcache.c:2512
 __lookup_slow+0x18d/0x4a0 fs/namei.c:1655
 lookup_slow fs/namei.c:1689 [inline]
 walk_component+0x7ac/0xda0 fs/namei.c:1811
 lookup_last fs/namei.c:2274 [inline]
 path_lookupat+0x1ff/0x8d0 fs/namei.c:2319
 filename_lookup+0x1ac/0x5a0 fs/namei.c:2349
 user_path include/linux/namei.h:62 [inline]
 do_mount+0x147/0x2f50 fs/namespace.c:2762
 ksys_mount+0xcf/0x130 fs/namespace.c:3038
 __do_sys_mount fs/namespace.c:3052 [inline]
 __se_sys_mount fs/namespace.c:3049 [inline]
 __x64_sys_mount+0xba/0x150 fs/namespace.c:3049
 do_syscall_64+0xf9/0x620 arch/x86/entry/common.c:293
 entry_SYSCALL_64_after_hwframe+0x49/0xbe
RIP: 0033:0x7fcb80b98c29
Code: ff ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 00 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 b8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007fcb80b242f8 EFLAGS: 00000246 ORIG_RAX: 00000000000000a5
RAX: ffffffffffffffda RBX: 00007fcb80c1d4b0 RCX: 00007fcb80b98c29
RDX: 0000000000000000 RSI: 00000000200002c0 RDI: 0000000000000000
RBP: 0030656c69662f2e R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000004 R11: 0000000000000246 R12: 00007fcb80bea0c8
R13: 00000000200011c0 R14: 000000807fffffff R15: 00007fcb80c1d4b8
INFO: task syz-executor106:8151 blocked for more than 140 seconds.
      Not tainted 4.19.211-syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
syz-executor106 D28712  8151   8104 0x00000004
Call Trace:
 context_switch kernel/sched/core.c:2828 [inline]
 __schedule+0x887/0x2040 kernel/sched/core.c:3517
 schedule+0x8d/0x1b0 kernel/sched/core.c:3561
 d_wait_lookup fs/dcache.c:2430 [inline]
 d_alloc_parallel+0x1292/0x19e0 fs/dcache.c:2512
 __lookup_slow+0x18d/0x4a0 fs/namei.c:1655
 lookup_slow fs/namei.c:1689 [inline]
 walk_component+0x7ac/0xda0 fs/namei.c:1811
 lookup_last fs/namei.c:2274 [inline]
 path_lookupat+0x1ff/0x8d0 fs/namei.c:2319
 filename_lookup+0x1ac/0x5a0 fs/namei.c:2349
 user_path include/linux/namei.h:62 [inline]
 do_mount+0x147/0x2f50 fs/namespace.c:2762
 ksys_mount+0xcf/0x130 fs/namespace.c:3038
 __do_sys_mount fs/namespace.c:3052 [inline]
 __se_sys_mount fs/namespace.c:3049 [inline]
 __x64_sys_mount+0xba/0x150 fs/namespace.c:3049
 do_syscall_64+0xf9/0x620 arch/x86/entry/common.c:293
 entry_SYSCALL_64_after_hwframe+0x49/0xbe
RIP: 0033:0x7fcb80b98c29
Code: ff ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 00 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 b8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007fcb80b242f8 EFLAGS: 00000246 ORIG_RAX: 00000000000000a5
RAX: ffffffffffffffda RBX: 00007fcb80c1d4b0 RCX: 00007fcb80b98c29
RDX: 0000000000000000 RSI: 00000000200002c0 RDI: 0000000000000000
RBP: 0030656c69662f2e R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000004 R11: 0000000000000246 R12: 00007fcb80bea0c8
R13: 00000000200011c0 R14: 000000807fffffff R15: 00007fcb80c1d4b8

Showing all locks held in the system:
1 lock held by khungtaskd/1570:
 #0: 000000009c8c953a (rcu_read_lock){....}, at: debug_show_all_locks+0x53/0x265 kernel/locking/lockdep.c:4441
1 lock held by kswapd0/1968:
1 lock held by kswapd1/1969:
1 lock held by in:imklog/7747:
 #0: 000000008723a080 (&f->f_pos_lock){+.+.}, at: __fdget_pos+0x26f/0x310 fs/file.c:767
1 lock held by syz-executor106/8111:
1 lock held by syz-executor106/8134:
 #0: 00000000467baf6d (&type->i_mutex_dir_key#7){.+.+}, at: inode_lock_shared include/linux/fs.h:758 [inline]
 #0: 00000000467baf6d (&type->i_mutex_dir_key#7){.+.+}, at: lookup_slow fs/namei.c:1688 [inline]
 #0: 00000000467baf6d (&type->i_mutex_dir_key#7){.+.+}, at: walk_component+0x798/0xda0 fs/namei.c:1811
2 locks held by syz-executor106/8119:
1 lock held by syz-executor106/8138:
 #0: 00000000367b3ef2 (&type->i_mutex_dir_key#7){.+.+}, at: inode_lock_shared include/linux/fs.h:758 [inline]
 #0: 00000000367b3ef2 (&type->i_mutex_dir_key#7){.+.+}, at: lookup_slow fs/namei.c:1688 [inline]
 #0: 00000000367b3ef2 (&type->i_mutex_dir_key#7){.+.+}, at: walk_component+0x798/0xda0 fs/namei.c:1811
2 locks held by syz-executor106/8112:
1 lock held by syz-executor106/8136:
 #0: 00000000493ba0f7 (&type->i_mutex_dir_key#7){.+.+}, at: inode_lock_shared include/linux/fs.h:758 [inline]
 #0: 00000000493ba0f7 (&type->i_mutex_dir_key#7){.+.+}, at: lookup_slow fs/namei.c:1688 [inline]
 #0: 00000000493ba0f7 (&type->i_mutex_dir_key#7){.+.+}, at: walk_component+0x798/0xda0 fs/namei.c:1811
1 lock held by syz-executor106/8120:
1 lock held by syz-executor106/8140:
 #0: 0000000050970ca5 (&type->i_mutex_dir_key#7){.+.+}, at: inode_lock_shared include/linux/fs.h:758 [inline]
 #0: 0000000050970ca5 (&type->i_mutex_dir_key#7){.+.+}, at: lookup_slow fs/namei.c:1688 [inline]
 #0: 0000000050970ca5 (&type->i_mutex_dir_key#7){.+.+}, at: walk_component+0x798/0xda0 fs/namei.c:1811
1 lock held by syz-executor106/8125:
1 lock held by syz-executor106/8142:
 #0: 00000000e8b3b783 (&type->i_mutex_dir_key#7){.+.+}, at: inode_lock_shared include/linux/fs.h:758 [inline]
 #0: 00000000e8b3b783 (&type->i_mutex_dir_key#7){.+.+}, at: lookup_slow fs/namei.c:1688 [inline]
 #0: 00000000e8b3b783 (&type->i_mutex_dir_key#7){.+.+}, at: walk_component+0x798/0xda0 fs/namei.c:1811
1 lock held by syz-executor106/8146:
1 lock held by syz-executor106/8151:
 #0: 00000000ce5fd961 (&type->i_mutex_dir_key#7){.+.+}, at: inode_lock_shared include/linux/fs.h:758 [inline]
 #0: 00000000ce5fd961 (&type->i_mutex_dir_key#7){.+.+}, at: lookup_slow fs/namei.c:1688 [inline]
 #0: 00000000ce5fd961 (&type->i_mutex_dir_key#7){.+.+}, at: walk_component+0x798/0xda0 fs/namei.c:1811

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

NMI backtrace for cpu 1
CPU: 1 PID: 1570 Comm: khungtaskd Not tainted 4.19.211-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/22/2022
Call Trace:
 __dump_stack lib/dump_stack.c:77 [inline]
 dump_stack+0x1fc/0x2ef lib/dump_stack.c:118
 nmi_cpu_backtrace.cold+0x63/0xa2 lib/nmi_backtrace.c:101
 nmi_trigger_cpumask_backtrace+0x1a6/0x1f0 lib/nmi_backtrace.c:62
 trigger_all_cpu_backtrace include/linux/nmi.h:146 [inline]
 check_hung_uninterruptible_tasks kernel/hung_task.c:203 [inline]
 watchdog+0x991/0xe60 kernel/hung_task.c:287
 kthread+0x33f/0x460 kernel/kthread.c:259
 ret_from_fork+0x24/0x30 arch/x86/entry/entry_64.S:415
Sending NMI from CPU 1 to CPUs 0:
NMI backtrace for cpu 0
CPU: 0 PID: 1968 Comm: kswapd0 Not tainted 4.19.211-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/22/2022
RIP: 0010:deref_stack_reg+0xe/0x1d0 arch/x86/kernel/unwind_orc.c:330
Code: ff ff ff 4c 89 ef e8 21 e6 6e 00 0f b6 44 24 04 eb a0 66 2e 0f 1f 84 00 00 00 00 00 48 b8 00 00 00 00 00 fc ff df 41 56 41 55 <49> 89 d5 41 54 49 89 fc 55 48 89 f5 53 48 83 ec 68 48 c7 44 24 08
RSP: 0018:ffff8880b0d7f168 EFLAGS: 00000046
RAX: dffffc0000000000 RBX: 1ffff110161afe39 RCX: ffff8880b0d7f660
RDX: ffff8880b0d7f2f8 RSI: ffff8880b0d7f688 RDI: ffff8880b0d7f2b0
RBP: 0000000000000001 R08: ffffffff8b97baf4 R09: ffffffff8b97bacc
R10: ffff8880b0d7f30f R11: 0000000000074071 R12: ffff8880b0d7f2f8
R13: ffff8880b0d7f2e5 R14: ffff8880b0d7f2b0 R15: ffffffff8b97baf0
FS:  0000000000000000(0000) GS:ffff8880ba000000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007fd34d1d1000 CR3: 00000000a085a000 CR4: 00000000003406f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 unwind_next_frame+0x9fc/0x1400 arch/x86/kernel/unwind_orc.c:502
 __save_stack_trace+0x9f/0x190 arch/x86/kernel/stacktrace.c:44
 save_stack mm/kasan/kasan.c:448 [inline]
 set_track mm/kasan/kasan.c:460 [inline]
 __kasan_slab_free+0x126/0x1f0 mm/kasan/kasan.c:521
 __cache_free mm/slab.c:3503 [inline]
 kmem_cache_free+0x7f/0x260 mm/slab.c:3765
 free_buffer_head+0x4a/0xf0 fs/buffer.c:3387
 try_to_free_buffers+0x38b/0x5d0 fs/buffer.c:3302
 try_to_release_page+0x263/0x390 mm/filemap.c:3359
 shrink_page_list+0x3abc/0x59d0 mm/vmscan.c:1413
 shrink_inactive_list+0x4f4/0x1820 mm/vmscan.c:1950
 shrink_list mm/vmscan.c:2254 [inline]
 shrink_node_memcg+0x5b9/0x1450 mm/vmscan.c:2522
 shrink_node.isra.0+0x25d/0x1300 mm/vmscan.c:2745
 kswapd_shrink_node mm/vmscan.c:3467 [inline]
 balance_pgdat mm/vmscan.c:3577 [inline]
 kswapd+0xb8d/0x1840 mm/vmscan.c:3801
 kthread+0x33f/0x460 kernel/kthread.c:259
 ret_from_fork+0x24/0x30 arch/x86/entry/entry_64.S:415

Crashes (5):
Time Kernel Commit Syzkaller Config Log Report Syz repro C repro VM info Assets (help?) Manager Title
2022/08/29 02:34 linux-4.19.y 3f8a27f9e27b 07177916 .config console log report syz C ci2-linux-4-19 INFO: task hung in d_alloc_parallel
2020/05/01 20:48 linux-4.19.y 765675379b62 143a10e9 .config console log report syz ci2-linux-4-19
2023/02/12 18:40 linux-4.19.y 3f8a27f9e27b 93e26d60 .config console log report info [disk image] [vmlinux] ci2-linux-4-19 INFO: task hung in d_alloc_parallel
2021/02/03 03:26 linux-4.19.y 811218eceeaa 624dad51 .config console log report info ci2-linux-4-19 INFO: task hung in d_alloc_parallel
2020/12/04 23:52 linux-4.19.y daefdc9eb24b 20366b87 .config console log report info ci2-linux-4-19
* Struck through repros no longer work on HEAD.