syzbot


INFO: task hung in iterate_supers (2)

Status: upstream: reported on 2023/02/24 15:59
Reported-by: syzbot+3763711c9d57def8d89c@syzkaller.appspotmail.com
First crash: 455d, last: 455d
Similar bugs (11)
Kernel Title Repro Cause bisect Fix bisect Count Last Reported Patched Status
android-414 INFO: task hung in iterate_supers 1 2034d 1871d 0/1 auto-closed as invalid on 2019/04/28 09:45
linux-4.14 INFO: task hung in iterate_supers 16 1242d 1856d 0/1 auto-closed as invalid on 2021/04/29 12:11
linux-4.19 INFO: task hung in iterate_supers (2) 1 1444d 1444d 0/1 auto-closed as invalid on 2020/10/09 12:15
upstream INFO: task hung in iterate_supers 9p C error 3416 6h44m 2146d 0/26 upstream: reported C repro on 2018/07/10 10:30
linux-5.15 INFO: task hung in iterate_supers origin:lts-only C 139 1d22h 443d 0/3 upstream: reported C repro on 2023/03/08 18:22
linux-6.1 INFO: task hung in iterate_supers 115 11d 441d 0/3 upstream: reported on 2023/03/10 21:24
linux-4.19 INFO: task hung in iterate_supers 7 1576d 1763d 0/1 auto-closed as invalid on 2020/05/29 21:42
linux-4.19 INFO: task hung in iterate_supers (3) vfs reiserfs ntfs syz 378 445d 1252d 0/1 upstream: reported syz repro on 2020/12/20 03:38
android-49 INFO: task hung in iterate_supers 19 2095d 2196d 0/3 auto-closed as invalid on 2019/02/25 14:49
android-414 INFO: task hung in iterate_supers (2) 1 1853d 1852d 0/1 auto-closed as invalid on 2019/10/25 08:49
upstream INFO: task can't die in iterate_supers (2) ceph fs 1 1076d 1072d 0/26 auto-closed as invalid on 2021/08/13 03:51

Sample crash report:
INFO: task syz-executor.5:10737 blocked for more than 140 seconds.
      Not tainted 4.14.306-syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
syz-executor.5  D25496 10737   8000 0x00000004
Call Trace:
 context_switch kernel/sched/core.c:2811 [inline]
 __schedule+0x88b/0x1de0 kernel/sched/core.c:3386
 schedule+0x8d/0x1b0 kernel/sched/core.c:3430
 __rwsem_down_read_failed_common kernel/locking/rwsem-xadd.c:292 [inline]
 rwsem_down_read_failed+0x1e6/0x350 kernel/locking/rwsem-xadd.c:309
 call_rwsem_down_read_failed+0x14/0x30 arch/x86/lib/rwsem.S:94
 __down_read arch/x86/include/asm/rwsem.h:66 [inline]
 down_read+0x44/0x80 kernel/locking/rwsem.c:26
 iterate_supers+0xda/0x490 fs/super.c:611
 sys_sync+0x78/0x130 fs/sync.c:113
 do_syscall_64+0x1d5/0x640 arch/x86/entry/common.c:292
 entry_SYSCALL_64_after_hwframe+0x5e/0xd3
RIP: 0033:0x7fbe434620f9
RSP: 002b:00007fbe419d4168 EFLAGS: 00000246 ORIG_RAX: 00000000000000a2
RAX: ffffffffffffffda RBX: 00007fbe43581f80 RCX: 00007fbe434620f9
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000000
RBP: 00007fbe434bdae9 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007ffe9a61f3ff R14: 00007fbe419d4300 R15: 0000000000022000
INFO: task syz-executor.5:10804 blocked for more than 140 seconds.
      Not tainted 4.14.306-syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
syz-executor.5  D28520 10804   8000 0x00000004
Call Trace:
 context_switch kernel/sched/core.c:2811 [inline]
 __schedule+0x88b/0x1de0 kernel/sched/core.c:3386
 schedule+0x8d/0x1b0 kernel/sched/core.c:3430
 __rwsem_down_read_failed_common kernel/locking/rwsem-xadd.c:292 [inline]
 rwsem_down_read_failed+0x1e6/0x350 kernel/locking/rwsem-xadd.c:309
 call_rwsem_down_read_failed+0x14/0x30 arch/x86/lib/rwsem.S:94
 __down_read arch/x86/include/asm/rwsem.h:66 [inline]
 down_read+0x44/0x80 kernel/locking/rwsem.c:26
 iterate_supers+0xda/0x490 fs/super.c:611
 sys_sync+0x78/0x130 fs/sync.c:113
kauditd_printk_skb: 2 callbacks suppressed
audit: type=1804 audit(1677254351.606:61): pid=14209 uid=0 auid=4294967295 ses=4294967295 op="invalid_pcr" cause="open_writers" comm="syz-executor.4" name="/root/syzkaller-testdir1698580166/syzkaller.wJHuDz/16/bus" dev="sda1" ino=14291 res=1
 do_syscall_64+0x1d5/0x640 arch/x86/entry/common.c:292
 entry_SYSCALL_64_after_hwframe+0x5e/0xd3
RIP: 0033:0x7fbe434620f9
RSP: 002b:00007fbe3a5b3168 EFLAGS: 00000246 ORIG_RAX: 00000000000000a2
audit: type=1804 audit(1677254351.706:62): pid=14222 uid=0 auid=4294967295 ses=4294967295 op="invalid_pcr" cause="ToMToU" comm="syz-executor.4" name="/root/syzkaller-testdir1698580166/syzkaller.wJHuDz/16/bus" dev="sda1" ino=14291 res=1
RAX: ffffffffffffffda RBX: 00007fbe43582050 RCX: 00007fbe434620f9
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000000
RBP: 00007fbe434bdae9 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007ffe9a61f3ff R14: 00007fbe3a5b3300 R15: 0000000000022000
INFO: task syz-executor.4:10739 blocked for more than 140 seconds.
      Not tainted 4.14.306-syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
syz-executor.4  D27904 10739   8019 0x00000004
Call Trace:
 context_switch kernel/sched/core.c:2811 [inline]
 __schedule+0x88b/0x1de0 kernel/sched/core.c:3386
 schedule+0x8d/0x1b0 kernel/sched/core.c:3430
 __rwsem_down_read_failed_common kernel/locking/rwsem-xadd.c:292 [inline]
 rwsem_down_read_failed+0x1e6/0x350 kernel/locking/rwsem-xadd.c:309
 call_rwsem_down_read_failed+0x14/0x30 arch/x86/lib/rwsem.S:94
 __down_read arch/x86/include/asm/rwsem.h:66 [inline]
 down_read+0x44/0x80 kernel/locking/rwsem.c:26
 iterate_supers+0xda/0x490 fs/super.c:611
 sys_sync+0x78/0x130 fs/sync.c:113
 do_syscall_64+0x1d5/0x640 arch/x86/entry/common.c:292
 entry_SYSCALL_64_after_hwframe+0x5e/0xd3
RIP: 0033:0x7f1da9ee90f9
RSP: 002b:00007f1da845b168 EFLAGS: 00000246 ORIG_RAX: 00000000000000a2
RAX: ffffffffffffffda RBX: 00007f1daa008f80 RCX: 00007f1da9ee90f9
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000000
RBP: 00007f1da9f44ae9 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007ffc61efd32f R14: 00007f1da845b300 R15: 0000000000022000
INFO: task syz-executor.4:10807 blocked for more than 140 seconds.
      Not tainted 4.14.306-syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
syz-executor.4  D29440 10807   8019 0x00000004
Call Trace:
 context_switch kernel/sched/core.c:2811 [inline]
 __schedule+0x88b/0x1de0 kernel/sched/core.c:3386
 schedule+0x8d/0x1b0 kernel/sched/core.c:3430
 __rwsem_down_read_failed_common kernel/locking/rwsem-xadd.c:292 [inline]
 rwsem_down_read_failed+0x1e6/0x350 kernel/locking/rwsem-xadd.c:309
 call_rwsem_down_read_failed+0x14/0x30 arch/x86/lib/rwsem.S:94
 __down_read arch/x86/include/asm/rwsem.h:66 [inline]
 down_read+0x44/0x80 kernel/locking/rwsem.c:26
 iterate_supers+0xda/0x490 fs/super.c:611
 sys_sync+0x78/0x130 fs/sync.c:113
 do_syscall_64+0x1d5/0x640 arch/x86/entry/common.c:292
 entry_SYSCALL_64_after_hwframe+0x5e/0xd3
RIP: 0033:0x7f1da9ee90f9
RSP: 002b:00007f1da103a168 EFLAGS: 00000246 ORIG_RAX: 00000000000000a2
RAX: ffffffffffffffda RBX: 00007f1daa009050 RCX: 00007f1da9ee90f9
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000000
RBP: 00007f1da9f44ae9 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007ffc61efd32f R14: 00007f1da103a300 R15: 0000000000022000
INFO: task syz-executor.2:10738 blocked for more than 140 seconds.
      Not tainted 4.14.306-syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
syz-executor.2  D28592 10738   8016 0x00000004
Call Trace:
 context_switch kernel/sched/core.c:2811 [inline]
 __schedule+0x88b/0x1de0 kernel/sched/core.c:3386
 schedule+0x8d/0x1b0 kernel/sched/core.c:3430
 __rwsem_down_read_failed_common kernel/locking/rwsem-xadd.c:292 [inline]
 rwsem_down_read_failed+0x1e6/0x350 kernel/locking/rwsem-xadd.c:309
 call_rwsem_down_read_failed+0x14/0x30 arch/x86/lib/rwsem.S:94
 __down_read arch/x86/include/asm/rwsem.h:66 [inline]
 down_read+0x44/0x80 kernel/locking/rwsem.c:26
 iterate_supers+0xda/0x490 fs/super.c:611
 sys_sync+0x78/0x130 fs/sync.c:113
 do_syscall_64+0x1d5/0x640 arch/x86/entry/common.c:292
 entry_SYSCALL_64_after_hwframe+0x5e/0xd3
RIP: 0033:0x7f8cb20d00f9
RSP: 002b:00007f8cb0642168 EFLAGS: 00000246 ORIG_RAX: 00000000000000a2
RAX: ffffffffffffffda RBX: 00007f8cb21eff80 RCX: 00007f8cb20d00f9
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000000
RBP: 00007f8cb212bae9 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007ffcdf69c2df R14: 00007f8cb0642300 R15: 0000000000022000
INFO: task syz-executor.2:10763 blocked for more than 140 seconds.
      Not tainted 4.14.306-syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
syz-executor.2  D29264 10763   8016 0x00000004
Call Trace:
 context_switch kernel/sched/core.c:2811 [inline]
 __schedule+0x88b/0x1de0 kernel/sched/core.c:3386
 schedule+0x8d/0x1b0 kernel/sched/core.c:3430
 __rwsem_down_read_failed_common kernel/locking/rwsem-xadd.c:292 [inline]
 rwsem_down_read_failed+0x1e6/0x350 kernel/locking/rwsem-xadd.c:309
 call_rwsem_down_read_failed+0x14/0x30 arch/x86/lib/rwsem.S:94
 __down_read arch/x86/include/asm/rwsem.h:66 [inline]
 down_read+0x44/0x80 kernel/locking/rwsem.c:26
 iterate_supers+0xda/0x490 fs/super.c:611
 sys_sync+0x78/0x130 fs/sync.c:113
 do_syscall_64+0x1d5/0x640 arch/x86/entry/common.c:292
 entry_SYSCALL_64_after_hwframe+0x5e/0xd3
RIP: 0033:0x7f8cb20d00f9
RSP: 002b:00007f8ca9221168 EFLAGS: 00000246 ORIG_RAX: 00000000000000a2
RAX: ffffffffffffffda RBX: 00007f8cb21f0050 RCX: 00007f8cb20d00f9
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000000
RBP: 00007f8cb212bae9 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007ffcdf69c2df R14: 00007f8ca9221300 R15: 0000000000022000
INFO: task syz-executor.1:10748 blocked for more than 140 seconds.
      Not tainted 4.14.306-syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
syz-executor.1  D30296 10748   7999 0x00000004
Call Trace:
 context_switch kernel/sched/core.c:2811 [inline]
 __schedule+0x88b/0x1de0 kernel/sched/core.c:3386
 schedule+0x8d/0x1b0 kernel/sched/core.c:3430
 __rwsem_down_read_failed_common kernel/locking/rwsem-xadd.c:292 [inline]
 rwsem_down_read_failed+0x1e6/0x350 kernel/locking/rwsem-xadd.c:309
 call_rwsem_down_read_failed+0x14/0x30 arch/x86/lib/rwsem.S:94
 __down_read arch/x86/include/asm/rwsem.h:66 [inline]
 down_read+0x44/0x80 kernel/locking/rwsem.c:26
 __get_super.part.0+0x271/0x390 fs/super.c:678
 __get_super include/linux/spinlock.h:317 [inline]
 get_super+0x2b/0x50 fs/super.c:707
 fsync_bdev+0x14/0xc0 fs/block_dev.c:495
 blkdev_flushbuf block/ioctl.c:430 [inline]
 blkdev_ioctl+0x883/0x1830 block/ioctl.c:514
 block_ioctl+0xd9/0x120 fs/block_dev.c:1893
 vfs_ioctl fs/ioctl.c:46 [inline]
 file_ioctl fs/ioctl.c:500 [inline]
 do_vfs_ioctl+0x75a/0xff0 fs/ioctl.c:684
base_sock_release(ffff88808d393640) sk=          (null)
audit: type=1804 audit(1677254353.677:63): pid=14236 uid=0 auid=4294967295 ses=4294967295 op="invalid_pcr" cause="open_writers" comm="syz-executor.1" name="/root/syzkaller-testdir3566088434/syzkaller.1FAfHv/21/bus" dev="sda1" ino=14300 res=1
base_sock_release(ffff88808d3931c0) sk=          (null)
base_sock_release(ffff88808d3b1080) sk=          (null)
audit: type=1804 audit(1677254353.747:64): pid=14247 uid=0 auid=4294967295 ses=4294967295 op="invalid_pcr" cause="ToMToU" comm="syz-executor.1" name="/root/syzkaller-testdir3566088434/syzkaller.1FAfHv/21/bus" dev="sda1" ino=14300 res=1
audit: type=1804 audit(1677254353.827:65): pid=14238 uid=0 auid=4294967295 ses=4294967295 op="invalid_pcr" cause="open_writers" comm="syz-executor.4" name="/root/syzkaller-testdir1698580166/syzkaller.wJHuDz/17/bus" dev="sda1" ino=14301 res=1
 SYSC_ioctl fs/ioctl.c:701 [inline]
 SyS_ioctl+0x7f/0xb0 fs/ioctl.c:692
audit: type=1804 audit(1677254353.837:66): pid=14240 uid=0 auid=4294967295 ses=4294967295 op="invalid_pcr" cause="open_writers" comm="syz-executor.3" name="/root/syzkaller-testdir3004110480/syzkaller.zBWcwK/71/bus" dev="sda1" ino=14302 res=1
 do_syscall_64+0x1d5/0x640 arch/x86/entry/common.c:292
audit: type=1804 audit(1677254353.897:67): pid=14250 uid=0 auid=4294967295 ses=4294967295 op="invalid_pcr" cause="ToMToU" comm="syz-executor.3" name="/root/syzkaller-testdir3004110480/syzkaller.zBWcwK/71/bus" dev="sda1" ino=14302 res=1
base_sock_release(ffff8880945f9ac0) sk=ffff88805c929580
 entry_SYSCALL_64_after_hwframe+0x5e/0xd3
base_sock_release(ffff888097f06600) sk=ffff8880a96bb280
RIP: 0033:0x7f5adc72b0f9
audit: type=1804 audit(1677254353.977:68): pid=14253 uid=0 auid=4294967295 ses=4294967295 op="invalid_pcr" cause="ToMToU" comm="syz-executor.4" name="/root/syzkaller-testdir1698580166/syzkaller.wJHuDz/17/bus" dev="sda1" ino=14301 res=1
RSP: 002b:00007f5adac7c168 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
RAX: ffffffffffffffda RBX: 00007f5adc84b050 RCX: 00007f5adc72b0f9
RDX: 0000000000000000 RSI: 0000000000001261 RDI: 0000000000000003
RBP: 00007f5adc786ae9 R08: 0000000000000000 R09: 0000000000000000
base_sock_release(ffff88805bbfca00) sk=ffff888053b26940
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
base_sock_release(ffff8880945f8180) sk=ffff88805c8e1680
R13: 00007ffc82c3151f R14: 00007f5adac7c300 R15: 0000000000022000
INFO: task syz-executor.0:10753 blocked for more than 140 seconds.
base_sock_release(ffff8880520cdb00) sk=ffff8880aa1e4140
      Not tainted 4.14.306-syzkaller #0
base_sock_release(ffff88808e6f3140) sk=ffff88805c523680
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
syz-executor.0  D27544 10753   7998 0x00000004
Call Trace:
 context_switch kernel/sched/core.c:2811 [inline]
 __schedule+0x88b/0x1de0 kernel/sched/core.c:3386
 schedule+0x8d/0x1b0 kernel/sched/core.c:3430
 __rwsem_down_read_failed_common kernel/locking/rwsem-xadd.c:292 [inline]
 rwsem_down_read_failed+0x1e6/0x350 kernel/locking/rwsem-xadd.c:309
 call_rwsem_down_read_failed+0x14/0x30 arch/x86/lib/rwsem.S:94
 __down_read arch/x86/include/asm/rwsem.h:66 [inline]
 down_read+0x44/0x80 kernel/locking/rwsem.c:26
 iterate_supers+0xda/0x490 fs/super.c:611
 sys_sync+0x78/0x130 fs/sync.c:113
 do_syscall_64+0x1d5/0x640 arch/x86/entry/common.c:292
 entry_SYSCALL_64_after_hwframe+0x5e/0xd3
RIP: 0033:0x7f7bff2b60f9
RSP: 002b:00007f7bfd828168 EFLAGS: 00000246 ORIG_RAX: 00000000000000a2
RAX: ffffffffffffffda RBX: 00007f7bff3d5f80 RCX: 00007f7bff2b60f9
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000000
RBP: 00007f7bff311ae9 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007ffca08c910f R14: 00007f7bfd828300 R15: 0000000000022000
INFO: task syz-executor.0:10809 blocked for more than 140 seconds.
      Not tainted 4.14.306-syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
syz-executor.0  D29936 10809   7998 0x00000004
Call Trace:
 context_switch kernel/sched/core.c:2811 [inline]
 __schedule+0x88b/0x1de0 kernel/sched/core.c:3386
 schedule+0x8d/0x1b0 kernel/sched/core.c:3430
 __rwsem_down_read_failed_common kernel/locking/rwsem-xadd.c:292 [inline]
 rwsem_down_read_failed+0x1e6/0x350 kernel/locking/rwsem-xadd.c:309
 call_rwsem_down_read_failed+0x14/0x30 arch/x86/lib/rwsem.S:94
 __down_read arch/x86/include/asm/rwsem.h:66 [inline]
 down_read+0x44/0x80 kernel/locking/rwsem.c:26
 iterate_supers+0xda/0x490 fs/super.c:611
 sys_sync+0x78/0x130 fs/sync.c:113
 do_syscall_64+0x1d5/0x640 arch/x86/entry/common.c:292
 entry_SYSCALL_64_after_hwframe+0x5e/0xd3
RIP: 0033:0x7f7bff2b60f9
RSP: 002b:00007f7bf6407168 EFLAGS: 00000246 ORIG_RAX: 00000000000000a2
RAX: ffffffffffffffda RBX: 00007f7bff3d6050 RCX: 00007f7bff2b60f9
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000000
RBP: 00007f7bff311ae9 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007ffca08c910f R14: 00007f7bf6407300 R15: 0000000000022000
INFO: task syz-executor.2:11989 blocked for more than 140 seconds.
      Not tainted 4.14.306-syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
syz-executor.2  D28752 11989  10887 0x00000004
Call Trace:
 context_switch kernel/sched/core.c:2811 [inline]
 __schedule+0x88b/0x1de0 kernel/sched/core.c:3386
 schedule+0x8d/0x1b0 kernel/sched/core.c:3430
 __rwsem_down_read_failed_common kernel/locking/rwsem-xadd.c:292 [inline]
 rwsem_down_read_failed+0x1e6/0x350 kernel/locking/rwsem-xadd.c:309
 call_rwsem_down_read_failed+0x14/0x30 arch/x86/lib/rwsem.S:94
 __down_read arch/x86/include/asm/rwsem.h:66 [inline]
 down_read+0x44/0x80 kernel/locking/rwsem.c:26
 iterate_supers+0xda/0x490 fs/super.c:611
 sys_sync+0x78/0x130 fs/sync.c:113
 do_syscall_64+0x1d5/0x640 arch/x86/entry/common.c:292
 entry_SYSCALL_64_after_hwframe+0x5e/0xd3
RIP: 0033:0x7fab54b5f0f9
RSP: 002b:00007fab530d1168 EFLAGS: 00000246 ORIG_RAX: 00000000000000a2
RAX: ffffffffffffffda RBX: 00007fab54c7ef80 RCX: 00007fab54b5f0f9
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000000
RBP: 00007fab54bbaae9 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007ffe82bdc24f R14: 00007fab530d1300 R15: 0000000000022000

Showing all locks held in the system:
1 lock held by khungtaskd/1528:
 #0:  (tasklist_lock){.+.+}, at: [<ffffffff8702e2fc>] debug_show_all_locks+0x7c/0x21a kernel/locking/lockdep.c:4548
1 lock held by syz-executor.5/10737:
 #0:  (&type->s_umount_key#53){++++}, at: [<ffffffff8187b63a>] iterate_supers+0xda/0x490 fs/super.c:611
1 lock held by syz-executor.5/10804:
 #0:  (&type->s_umount_key#53){++++}, at: [<ffffffff8187b63a>] iterate_supers+0xda/0x490 fs/super.c:611
1 lock held by syz-executor.4/10739:
 #0:  (&type->s_umount_key#53){++++}, at: [<ffffffff8187b63a>] iterate_supers+0xda/0x490 fs/super.c:611
1 lock held by syz-executor.4/10807:
 #0:  (&type->s_umount_key#53){++++}, at: [<ffffffff8187b63a>] iterate_supers+0xda/0x490 fs/super.c:611
1 lock held by syz-executor.2/10738:
 #0:  (&type->s_umount_key#53){++++}, at: [<ffffffff8187b63a>] iterate_supers+0xda/0x490 fs/super.c:611
1 lock held by syz-executor.2/10763:
 #0:  (&type->s_umount_key#53){++++}, at: [<ffffffff8187b63a>] iterate_supers+0xda/0x490 fs/super.c:611
1 lock held by syz-executor.1/10748:
 #0:  (&type->s_umount_key#53){++++}, at: [<ffffffff8187aaa1>] __get_super.part.0+0x271/0x390 fs/super.c:678
1 lock held by syz-executor.0/10753:
 #0:  (&type->s_umount_key#53){++++}, at: [<ffffffff8187b63a>] iterate_supers+0xda/0x490 fs/super.c:611
1 lock held by syz-executor.0/10809:
 #0:  (&type->s_umount_key#53){++++}, at: [<ffffffff8187b63a>] iterate_supers+0xda/0x490 fs/super.c:611
1 lock held by syz-executor.2/11989:
 #0:  (&type->s_umount_key#53){++++}, at: [<ffffffff8187b63a>] iterate_supers+0xda/0x490 fs/super.c:611
1 lock held by syz-executor.2/12005:
 #0:  (&type->s_umount_key#53){++++}, at: [<ffffffff8187b63a>] iterate_supers+0xda/0x490 fs/super.c:611
1 lock held by syz-executor.5/12065:
 #0:  (&type->s_umount_key#53){++++}, at: [<ffffffff8187b63a>] iterate_supers+0xda/0x490 fs/super.c:611
1 lock held by syz-executor.5/12119:
 #0:  (&type->s_umount_key#53){++++}, at: [<ffffffff8187b63a>] iterate_supers+0xda/0x490 fs/super.c:611
2 locks held by syz-executor.1/12086:
 #0:  (&bdev->bd_fsfreeze_mutex){+.+.}, at: [<ffffffff81879b31>] mount_bdev+0x71/0x360 fs/super.c:1101
 #1:  (&type->s_umount_key#53){++++}, at: [<ffffffff81878bc5>] grab_super+0x55/0x140 fs/super.c:373
1 lock held by syz-executor.1/12095:
 #0:  (&type->s_umount_key#53){++++}, at: [<ffffffff8187aaa1>] __get_super.part.0+0x271/0x390 fs/super.c:678
1 lock held by syz-executor.4/12125:
 #0:  (&type->s_umount_key#53){++++}, at: [<ffffffff8187b63a>] iterate_supers+0xda/0x490 fs/super.c:611
1 lock held by syz-executor.4/12143:
 #0:  (&type->s_umount_key#53){++++}, at: [<ffffffff8187b63a>] iterate_supers+0xda/0x490 fs/super.c:611
1 lock held by syz-executor.0/12122:
 #0:  (&type->s_umount_key#53){++++}, at: [<ffffffff8187b63a>] iterate_supers+0xda/0x490 fs/super.c:611
1 lock held by syz-executor.0/12142:
 #0:  (&type->s_umount_key#53){++++}, at: [<ffffffff8187b63a>] iterate_supers+0xda/0x490 fs/super.c:611
1 lock held by syz-executor.1/13193:
 #0:  (&bdev->bd_fsfreeze_mutex){+.+.}, at: [<ffffffff81879b31>] mount_bdev+0x71/0x360 fs/super.c:1101
1 lock held by syz-executor.1/13202:
 #0:  (&type->s_umount_key#53){++++}, at: [<ffffffff8187aaa1>] __get_super.part.0+0x271/0x390 fs/super.c:678

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

NMI backtrace for cpu 1
CPU: 1 PID: 1528 Comm: khungtaskd Not tainted 4.14.306-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/16/2023
Call Trace:
 __dump_stack lib/dump_stack.c:17 [inline]
 dump_stack+0x1b2/0x281 lib/dump_stack.c:58
 nmi_cpu_backtrace.cold+0x57/0x93 lib/nmi_backtrace.c:101
 nmi_trigger_cpumask_backtrace+0x13a/0x180 lib/nmi_backtrace.c:62
 trigger_all_cpu_backtrace include/linux/nmi.h:140 [inline]
 check_hung_uninterruptible_tasks kernel/hung_task.c:195 [inline]
 watchdog+0x5b9/0xb40 kernel/hung_task.c:274
 kthread+0x30d/0x420 kernel/kthread.c:232
 ret_from_fork+0x24/0x30 arch/x86/entry/entry_64.S:406
Sending NMI from CPU 1 to CPUs 0:
NMI backtrace for cpu 0
CPU: 0 PID: 4613 Comm: systemd-journal Not tainted 4.14.306-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/16/2023
task: ffff8880a1e7a580 task.stack: ffff8880a1e80000
RIP: 0010:deref_stack_reg arch/x86/kernel/unwind_orc.c:289 [inline]
RIP: 0010:deref_stack_reg+0x11f/0x1a0 arch/x86/kernel/unwind_orc.c:283
RSP: 0018:ffff8880a1e879f0 EFLAGS: 00000297
RAX: ffff8880a1e88000 RBX: 1ffff110143d0f3f RCX: ffffffff8a7291a2
RDX: ffff8880a1e87b68 RSI: ffff8880a1e87a18 RDI: ffff8880a1e87dd0
RBP: ffff8880a1e87dd0 R08: 0000000000000001 R09: 0000000000000001
R10: ffff8880a1e87e00 R11: 0000000000000001 R12: ffff8880a1e87b28
R13: ffff8880a1e87b68 R14: ffff8880a1e80000 R15: ffff8880a1e87b28
FS:  00007fd30f4af8c0(0000) GS:ffff8880ba400000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007fd30ca14000 CR3: 00000000a1d2c000 CR4: 00000000003426f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 unwind_next_frame+0xfcc/0x17d0 arch/x86/kernel/unwind_orc.c:474
 __save_stack_trace+0x90/0x160 arch/x86/kernel/stacktrace.c:44
 save_stack mm/kasan/kasan.c:447 [inline]
 set_track mm/kasan/kasan.c:459 [inline]
 kasan_kmalloc+0xeb/0x160 mm/kasan/kasan.c:551
 slab_post_alloc_hook mm/slab.h:442 [inline]
 slab_alloc mm/slab.c:3390 [inline]
 kmem_cache_alloc+0x111/0x3c0 mm/slab.c:3550
 prepare_creds+0x39/0x490 kernel/cred.c:255
 SYSC_faccessat fs/open.c:365 [inline]
 SyS_faccessat+0x7b/0x680 fs/open.c:353
 do_syscall_64+0x1d5/0x640 arch/x86/entry/common.c:292
 entry_SYSCALL_64_after_hwframe+0x5e/0xd3
RIP: 0033:0x7fd30e76a9c7
RSP: 002b:00007ffe00433b08 EFLAGS: 00000246 ORIG_RAX: 0000000000000015
RAX: ffffffffffffffda RBX: 00007ffe00436a20 RCX: 00007fd30e76a9c7
RDX: 00007fd30f1dba00 RSI: 0000000000000000 RDI: 00005653d01f99a3
RBP: 00007ffe00433b40 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000069 R11: 0000000000000246 R12: 0000000000000000
R13: 0000000000000000 R14: 00007ffe00436a20 R15: 00007ffe00434030
Code: 0f 85 93 00 00 00 49 8b 74 24 28 4c 89 e2 48 89 ef e8 66 26 f8 ff 41 89 c0 31 c0 45 85 c0 75 32 48 8d 74 24 28 48 89 ef 4c 89 ea <e8> cc fe ff ff 48 c1 ea 03 48 8b 6c 24 28 48 b8 00 00 00 00 00 

Crashes (1):
Time Kernel Commit Syzkaller Config Log Report Syz repro C repro VM info Assets (help?) Manager Title
2023/02/24 15:59 linux-4.14.y 1e61bd26fa2c ee50e71c .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-4-14 INFO: task hung in iterate_supers
* Struck through repros no longer work on HEAD.