INFO: task syz-executor:16827 blocked for more than 143 seconds.
Not tainted syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz-executor state:D stack:21800 pid:16827 ppid:1 flags:0x00004004
Call Trace:
context_switch kernel/sched/core.c:5382 [inline]
__schedule+0x15ae/0x4660 kernel/sched/core.c:6701
schedule+0xbd/0x170 kernel/sched/core.c:6775
schedule_preempt_disabled+0x13/0x20 kernel/sched/core.c:6834
__mutex_lock_common kernel/locking/mutex.c:679 [inline]
__mutex_lock+0x673/0xc80 kernel/locking/mutex.c:747
lmLogClose+0xad/0x530 fs/jfs/jfs_logmgr.c:1444
jfs_umount+0x2ca/0x3a0 fs/jfs/jfs_umount.c:114
jfs_put_super+0x8c/0x190 fs/jfs/super.c:194
generic_shutdown_super+0x134/0x2b0 fs/super.c:693
kill_block_super+0x44/0x90 fs/super.c:1660
deactivate_locked_super+0x97/0x100 fs/super.c:481
cleanup_mnt+0x3d7/0x460 fs/namespace.c:1259
task_work_run+0x1d4/0x260 kernel/task_work.c:245
resume_user_mode_work include/linux/resume_user_mode.h:49 [inline]
exit_to_user_mode_loop+0xe6/0x110 kernel/entry/common.c:177
exit_to_user_mode_prepare+0xee/0x180 kernel/entry/common.c:210
__syscall_exit_to_user_mode_work kernel/entry/common.c:291 [inline]
syscall_exit_to_user_mode+0x1a/0x50 kernel/entry/common.c:302
do_syscall_64+0x61/0xb0 arch/x86/entry/common.c:82
entry_SYSCALL_64_after_hwframe+0x68/0xd2
RIP: 0033:0x7efd9b59f317
RSP: 002b:00007fff7ba71278 EFLAGS: 00000246 ORIG_RAX: 00000000000000a6
RAX: 0000000000000000 RBX: 00007efd9b634474 RCX: 00007efd9b59f317
RDX: 0000000000000000 RSI: 0000000000000009 RDI: 00007fff7ba71330
RBP: 00007fff7ba71330 R08: 00007fff7ba72330 R09: 00000000ffffffff
R10: 0000000000000000 R11: 0000000000000246 R12: 00007fff7ba723c0
R13: 00007efd9b634474 R14: 000000000009c8e9 R15: 00007fff7ba72400
Showing all locks held in the system:
3 locks held by kworker/u4:0/11:
1 lock held by khungtaskd/29:
#0: ffffffff8d131da0 (rcu_read_lock){....}-{1:2}, at: rcu_lock_acquire include/linux/rcupdate.h:334 [inline]
#0: ffffffff8d131da0 (rcu_read_lock){....}-{1:2}, at: rcu_read_lock include/linux/rcupdate.h:786 [inline]
#0: ffffffff8d131da0 (rcu_read_lock){....}-{1:2}, at: debug_show_all_locks+0x55/0x290 kernel/locking/lockdep.c:6633
2 locks held by getty/5530:
#0: ffff8880315320a0 (&tty->ldisc_sem){++++}-{0:0}, at: tty_ldisc_ref_wait+0x25/0x70 drivers/tty/tty_ldisc.c:243
#1: ffffc9000327b2f0 (&ldata->atomic_read_lock){+.+.}-{3:3}, at: n_tty_read+0x428/0x1370 drivers/tty/n_tty.c:2217
2 locks held by kworker/1:3/5766:
2 locks held by syz-executor/15497:
#0: ffff88802f1a00e0 (&type->s_umount_key#76){++++}-{3:3}, at: __super_lock fs/super.c:56 [inline]
#0: ffff88802f1a00e0 (&type->s_umount_key#76){++++}-{3:3}, at: __super_lock_excl fs/super.c:71 [inline]
#0: ffff88802f1a00e0 (&type->s_umount_key#76){++++}-{3:3}, at: deactivate_super+0xa4/0xe0 fs/super.c:513
#1: ffffffff8d54ac68 (jfs_log_mutex){+.+.}-{3:3}, at: lmLogClose+0xad/0x530 fs/jfs/jfs_logmgr.c:1444
2 locks held by syz-executor/16756:
#0: ffff88806adbc0e0 (&type->s_umount_key#76){++++}-{3:3}, at: __super_lock fs/super.c:56 [inline]
#0: ffff88806adbc0e0 (&type->s_umount_key#76){++++}-{3:3}, at: __super_lock_excl fs/super.c:71 [inline]
#0: ffff88806adbc0e0 (&type->s_umount_key#76){++++}-{3:3}, at: deactivate_super+0xa4/0xe0 fs/super.c:513
#1: ffffffff8d54ac68 (jfs_log_mutex){+.+.}-{3:3}, at: lmLogClose+0xad/0x530 fs/jfs/jfs_logmgr.c:1444
2 locks held by syz-executor/16827:
#0: ffff88801ffd60e0 (&type->s_umount_key#76){++++}-{3:3}, at: __super_lock fs/super.c:56 [inline]
#0: ffff88801ffd60e0 (&type->s_umount_key#76){++++}-{3:3}, at: __super_lock_excl fs/super.c:71 [inline]
#0: ffff88801ffd60e0 (&type->s_umount_key#76){++++}-{3:3}, at: deactivate_super+0xa4/0xe0 fs/super.c:513
#1: ffffffff8d54ac68 (jfs_log_mutex){+.+.}-{3:3}, at: lmLogClose+0xad/0x530 fs/jfs/jfs_logmgr.c:1444
2 locks held by syz-executor/17110:
#0: ffff8880365260e0 (&type->s_umount_key#76){++++}-{3:3}, at: __super_lock fs/super.c:56 [inline]
#0: ffff8880365260e0 (&type->s_umount_key#76){++++}-{3:3}, at: __super_lock_excl fs/super.c:71 [inline]
#0: ffff8880365260e0 (&type->s_umount_key#76){++++}-{3:3}, at: deactivate_super+0xa4/0xe0 fs/super.c:513
#1: ffffffff8d54ac68 (jfs_log_mutex){+.+.}-{3:3}, at: lmLogClose+0xad/0x530 fs/jfs/jfs_logmgr.c:1444
2 locks held by syz-executor/17937:
#0: ffff88805e1e40e0 (&type->s_umount_key#76){++++}-{3:3}, at: __super_lock fs/super.c:56 [inline]
#0: ffff88805e1e40e0 (&type->s_umount_key#76){++++}-{3:3}, at: __super_lock_excl fs/super.c:71 [inline]
#0: ffff88805e1e40e0 (&type->s_umount_key#76){++++}-{3:3}, at: deactivate_super+0xa4/0xe0 fs/super.c:513
#1: ffffffff8d54ac68 (jfs_log_mutex){+.+.}-{3:3}, at: lmLogClose+0xad/0x530 fs/jfs/jfs_logmgr.c:1444
2 locks held by syz.1.4641/18014:
#0: ffff8880781f60e0 (&type->s_umount_key#76){++++}-{3:3}, at: do_remount fs/namespace.c:2924 [inline]
#0: ffff8880781f60e0 (&type->s_umount_key#76){++++}-{3:3}, at: path_mount+0xcb8/0xfa0 fs/namespace.c:3705
#1: ffffffff8d54ac68 (jfs_log_mutex){+.+.}-{3:3}, at: lmLogClose+0xad/0x530 fs/jfs/jfs_logmgr.c:1444
2 locks held by syz-executor/18245:
#0: ffff888069bb00e0 (&type->s_umount_key#76){++++}-{3:3}, at: __super_lock fs/super.c:56 [inline]
#0: ffff888069bb00e0 (&type->s_umount_key#76){++++}-{3:3}, at: __super_lock_excl fs/super.c:71 [inline]
#0: ffff888069bb00e0 (&type->s_umount_key#76){++++}-{3:3}, at: deactivate_super+0xa4/0xe0 fs/super.c:513
#1: ffffffff8d54ac68 (jfs_log_mutex){+.+.}-{3:3}, at: lmLogClose+0xad/0x530 fs/jfs/jfs_logmgr.c:1444
2 locks held by syz-executor/20212:
#0: ffffffff8e3d6ac8 (rtnl_mutex){+.+.}-{3:3}, at: rtnl_lock net/core/rtnetlink.c:78 [inline]
#0: ffffffff8e3d6ac8 (rtnl_mutex){+.+.}-{3:3}, at: rtnetlink_rcv_msg+0x7ed/0xf90 net/core/rtnetlink.c:6481
#1: ffffffff8d137778 (rcu_state.exp_mutex){+.+.}-{3:3}, at: exp_funnel_lock kernel/rcu/tree_exp.h:292 [inline]
#1: ffffffff8d137778 (rcu_state.exp_mutex){+.+.}-{3:3}, at: synchronize_rcu_expedited+0x306/0x880 kernel/rcu/tree_exp.h:1004
=============================================
NMI backtrace for cpu 1
CPU: 1 PID: 29 Comm: khungtaskd Not tainted syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/24/2026
Call Trace:
dump_stack_lvl+0x18c/0x250 lib/dump_stack.c:106
nmi_cpu_backtrace+0x3a6/0x3e0 lib/nmi_backtrace.c:113
nmi_trigger_cpumask_backtrace+0x17a/0x2f0 lib/nmi_backtrace.c:62
trigger_all_cpu_backtrace include/linux/nmi.h:160 [inline]
check_hung_uninterruptible_tasks kernel/hung_task.c:222 [inline]
watchdog+0xf59/0xfa0 kernel/hung_task.c:379
kthread+0x2fa/0x390 kernel/kthread.c:388
ret_from_fork+0x48/0x80 arch/x86/kernel/process.c:152
ret_from_fork_asm+0x11/0x20 arch/x86/entry/entry_64.S:293
Sending NMI from CPU 1 to CPUs 0:
NMI backtrace for cpu 0
CPU: 0 PID: 19970 Comm: syz-executor Not tainted syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/24/2026
RIP: 0010:get_pfnblock_flags_mask mm/page_alloc.c:414 [inline]
RIP: 0010:get_pfnblock_migratetype mm/page_alloc.c:420 [inline]
RIP: 0010:free_unref_page_prepare+0x32c/0x8f0 mm/page_alloc.c:2369
Code: 83 e4 18 4e 8d 74 20 18 4c 89 f0 48 c1 e8 03 48 b9 00 00 00 00 00 fc ff df 80 3c 08 00 74 08 4c 89 f7 e8 57 5d 0c 00 4d 8b 36 <41> 80 e7 3c 44 89 f9 49 d3 ee 41 83 e6 07 48 83 c3 20 48 89 d8 48
RSP: 0018:ffffc900047df5d0 EFLAGS: 00000246
RAX: 1ffff11027fff157 RBX: ffffea0000fcb780 RCX: dffffc0000000000
RDX: 0000000000000000 RSI: 00000000000000ff RDI: ffffed1007e5be00
RBP: 0000000000000000 R08: dffffc0000000000 R09: 0000000000000000
R10: ffffed1007e5bc00 R11: fffffbfff1d18ee6 R12: 0000000000000018
R13: 0000000000000001 R14: 1111111100000000 R15: 00000000000007e5
FS: 000055558c185500(0000) GS:ffff8880b8e00000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f748c03f000 CR3: 000000003bded000 CR4: 00000000003506f0
Call Trace:
free_unref_page_list+0xbe/0x860 mm/page_alloc.c:2505
release_pages+0x208a/0x2300 mm/swap.c:1022
__folio_batch_release+0x71/0xe0 mm/swap.c:1042
folio_batch_release include/linux/pagevec.h:83 [inline]
shmem_undo_range+0x5ff/0x1a80 mm/shmem.c:1026
shmem_truncate_range mm/shmem.c:1135 [inline]
shmem_evict_inode+0x285/0xa70 mm/shmem.c:1264
evict+0x4b7/0x8a0 fs/inode.c:705
__dentry_kill+0x412/0x630 fs/dcache.c:611
dentry_kill+0xb8/0x290 fs/dcache.c:-1
dput+0xfe/0x1e0 fs/dcache.c:918
__fput+0x5b2/0x940 fs/file_table.c:426
task_work_run+0x1d4/0x260 kernel/task_work.c:245
resume_user_mode_work include/linux/resume_user_mode.h:49 [inline]
exit_to_user_mode_loop+0xe6/0x110 kernel/entry/common.c:177
exit_to_user_mode_prepare+0xee/0x180 kernel/entry/common.c:210
__syscall_exit_to_user_mode_work kernel/entry/common.c:291 [inline]
syscall_exit_to_user_mode+0x1a/0x50 kernel/entry/common.c:302
do_syscall_64+0x61/0xb0 arch/x86/entry/common.c:82
entry_SYSCALL_64_after_hwframe+0x68/0xd2
RIP: 0033:0x7f667119f317
Code: a2 c7 05 dc 43 25 00 00 00 00 00 eb 96 e8 e1 12 00 00 90 31 f6 e9 09 00 00 00 66 0f 1f 84 00 00 00 00 00 b8 a6 00 00 00 0f 05 <48> 3d 00 f0 ff ff 77 01 c3 48 c7 c2 e8 ff ff ff f7 d8 64 89 02 b8
RSP: 002b:00007ffc1a3abb68 EFLAGS: 00000246 ORIG_RAX: 00000000000000a6
RAX: 0000000000000000 RBX: 00007f6671234474 RCX: 00007f667119f317
RDX: 0000000000000000 RSI: 0000000000000009 RDI: 00007ffc1a3abc20
RBP: 00007ffc1a3abc20 R08: 00007ffc1a3acc20 R09: 00000000ffffffff
R10: 0000000000000000 R11: 0000000000000246 R12: 00007ffc1a3accb0
R13: 00007f6671234474 R14: 00000000000c0510 R15: 00007ffc1a3accf0