INFO: task syz.0.26:5373 blocked for more than 143 seconds.
Not tainted syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz.0.26 state:D stack:26240 pid: 5373 ppid: 5351 flags:0x00004004
Call Trace:
context_switch kernel/sched/core.c:5049 [inline]
__schedule+0x11bb/0x4390 kernel/sched/core.c:6395
schedule+0x11b/0x1e0 kernel/sched/core.c:6478
rwsem_down_write_slowpath+0xc46/0x11f0 kernel/locking/rwsem.c:1165
user_get_super+0xcd/0x240 fs/super.c:848
quotactl_block fs/quota/quota.c:889 [inline]
__do_sys_quotactl fs/quota/quota.c:953 [inline]
__se_sys_quotactl+0x45e/0x6c0 fs/quota/quota.c:915
do_syscall_x64 arch/x86/entry/common.c:50 [inline]
do_syscall_64+0x4c/0xa0 arch/x86/entry/common.c:80
entry_SYSCALL_64_after_hwframe+0x66/0xd0
RIP: 0033:0x7f21335eb929
RSP: 002b:00007f213285b038 EFLAGS: 00000246 ORIG_RAX: 00000000000000b3
RAX: ffffffffffffffda RBX: 00007f2133812fa0 RCX: 00007f21335eb929
RDX: 0000000000000000 RSI: 00002000000000c0 RDI: ffffffff80000302
RBP: 00007f213366db39 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 0000000000000000 R14: 00007f2133812fa0 R15: 00007ffc6bed1e68
Showing all locks held in the system:
1 lock held by khungtaskd/27:
#0: ffffffff8c11c660 (rcu_read_lock){....}-{1:2}, at: rcu_lock_acquire+0x0/0x30
2 locks held by kworker/u4:3/549:
2 locks held by getty/3952:
#0: ffff88802bd53098 (&tty->ldisc_sem){++++}-{0:0}, at: tty_ldisc_ref_wait+0x21/0x70 drivers/tty/tty_ldisc.c:252
#1: ffffc900026562e8 (&ldata->atomic_read_lock){+.+.}-{3:3}, at: n_tty_read+0x5ba/0x1a30 drivers/tty/n_tty.c:2158
3 locks held by syz.0.16/5078:
3 locks held by syz.1.17/5105:
3 locks held by syz.2.18/5127:
3 locks held by syz.3.19/5150:
3 locks held by syz.4.20/5185:
3 locks held by syz.5.21/5215:
3 locks held by syz.6.22/5245:
3 locks held by syz.7.23/5282:
3 locks held by syz.8.24/5311:
3 locks held by syz.9.25/5348:
1 lock held by syz.0.26/5373:
#0: ffff888024a540e0 (&type->s_umount_key#53){+.+.}-{3:3}, at: user_get_super+0xcd/0x240 fs/super.c:848
1 lock held by syz.1.27/5396:
#0: ffff888143fec0e0 (&type->s_umount_key#53){+.+.}-{3:3}, at: user_get_super+0xcd/0x240 fs/super.c:848
1 lock held by syz.2.28/5426:
#0: ffff88807d11c0e0 (&type->s_umount_key#53){+.+.}-{3:3}, at: user_get_super+0xcd/0x240 fs/super.c:848
1 lock held by syz.3.29/5451:
#0: ffff88807a51e0e0 (&type->s_umount_key#53){+.+.}-{3:3}, at: user_get_super+0xcd/0x240 fs/super.c:848
1 lock held by syz.4.30/5486:
#0: ffff88805c7c60e0 (&type->s_umount_key#53){+.+.}-{3:3}, at: user_get_super+0xcd/0x240 fs/super.c:848
1 lock held by syz-executor115/5497:
#0: ffff888024a540e0 (&type->s_umount_key#53){+.+.}-{3:3}, at: user_get_super+0xcd/0x240 fs/super.c:848
1 lock held by syz.5.31/5528:
#0: ffff8880237ea0e0 (&type->s_umount_key#53){+.+.}-{3:3}, at: user_get_super+0xcd/0x240 fs/super.c:848
=============================================
NMI backtrace for cpu 0
CPU: 0 PID: 27 Comm: khungtaskd Not tainted syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 08/18/2025
Call Trace:
dump_stack_lvl+0x168/0x230 lib/dump_stack.c:106
nmi_cpu_backtrace+0x397/0x3d0 lib/nmi_backtrace.c:111
nmi_trigger_cpumask_backtrace+0x163/0x280 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+0xe0f/0xe50 kernel/hung_task.c:369
kthread+0x436/0x520 kernel/kthread.c:334
ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:287
Sending NMI from CPU 0 to CPUs 1:
NMI backtrace for cpu 1
CPU: 1 PID: 5215 Comm: syz.5.21 Not tainted syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 08/18/2025
RIP: 0010:lock_is_held_type+0x52/0x190 kernel/locking/lockdep.c:-1
Code: 0f 84 03 01 00 00 65 8b 05 4b 88 59 76 85 c0 0f 85 f4 00 00 00 65 48 8b 1d bb 7e 59 76 83 bb ec 0a 00 00 00 0f 85 df 00 00 00 <41> 89 f7 49 89 fe 48 c7 04 24 00 00 00 00 9c 8f 04 24 4c 8b 2c 24
RSP: 0018:ffffc9000387f0f8 EFLAGS: 00000246
RAX: 0000000000000000 RBX: ffff88802ab9bb80 RCX: ffff88802ab9bb80
RDX: 0000000000000000 RSI: 00000000ffffffff RDI: ffffffff8c11c6c0
RBP: 00000000ffffffff R08: dffffc0000000000 R09: ffffed100e851492
R10: ffffed100e851492 R11: 1ffff1100e851491 R12: dffffc0000000000
R13: dffffc0000000000 R14: ffff88807428a488 R15: 00000000ffffffff
FS: 00007efea160a6c0(0000) GS:ffff8880b9100000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f4f4fdbf6c8 CR3: 000000007597e000 CR4: 00000000003506e0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
lock_is_held include/linux/lockdep.h:287 [inline]
___might_sleep+0xa3/0x600 kernel/sched/core.c:9624
wait_on_buffer include/linux/buffer_head.h:388 [inline]
search_by_key+0x780/0x4390 fs/reiserfs/stree.c:689
search_by_entry_key+0x32/0x1370 fs/reiserfs/namei.c:125
reiserfs_find_entry+0xeec/0x18e0 fs/reiserfs/namei.c:322
reiserfs_lookup+0x1a7/0x420 fs/reiserfs/namei.c:368
__lookup_slow+0x27d/0x3d0 fs/namei.c:1663
lookup_one_len+0x18e/0x2c0 fs/namei.c:2718
reiserfs_lookup_privroot+0x85/0x1e0 fs/reiserfs/xattr.c:980
reiserfs_fill_super+0x1f65/0x23e0 fs/reiserfs/super.c:2178
mount_bdev+0x287/0x3c0 fs/super.c:1400
legacy_get_tree+0xe6/0x180 fs/fs_context.c:611
vfs_get_tree+0x88/0x270 fs/super.c:1530
do_new_mount+0x24a/0xa40 fs/namespace.c:3025
do_mount fs/namespace.c:3368 [inline]
__do_sys_mount fs/namespace.c:3576 [inline]
__se_sys_mount+0x2d6/0x3c0 fs/namespace.c:3553
do_syscall_x64 arch/x86/entry/common.c:50 [inline]
do_syscall_64+0x4c/0xa0 arch/x86/entry/common.c:80
entry_SYSCALL_64_after_hwframe+0x66/0xd0
RIP: 0033:0x7efea239c0ca
Code: d8 64 89 02 48 c7 c0 ff ff ff ff eb a6 e8 de 1a 00 00 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 00 49 89 ca b8 a5 00 00 00 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 a8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007efea1609e68 EFLAGS: 00000246 ORIG_RAX: 00000000000000a5
RAX: ffffffffffffffda RBX: 00007efea1609ef0 RCX: 00007efea239c0ca
RDX: 00002000000000c0 RSI: 0000200000000040 RDI: 00007efea1609eb0
RBP: 00002000000000c0 R08: 00007efea1609ef0 R09: 000000000000800c
R10: 000000000000800c R11: 0000000000000246 R12: 0000200000000040
R13: 00007efea1609eb0 R14: 000000000000111c R15: 0000200000000300