INFO: task syz.9.100:6807 blocked in I/O wait for more than 143 seconds.
Not tainted syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz.9.100 state:D stack:23856 pid:6807 tgid:6806 ppid:6395 task_flags:0x400140 flags:0x00080003
Call Trace:
context_switch kernel/sched/core.c:5510 [inline]
__schedule+0x16dc/0x5500 kernel/sched/core.c:7234
__schedule_loop kernel/sched/core.c:7311 [inline]
schedule+0x164/0x2b0 kernel/sched/core.c:7326
io_schedule+0x80/0xe0 kernel/sched/core.c:8154
TXN_SLEEP_DROP_LOCK fs/jfs/jfs_txnmgr.c:125 [inline]
txBegin+0x281/0xbe0 fs/jfs/jfs_txnmgr.c:376
jfs_unlink+0x210/0x9e0 fs/jfs/namei.c:491
vfs_unlink+0x27b/0x6e0 fs/namei.c:5515
ovl_do_unlink fs/overlayfs/overlayfs.h:224 [inline]
ovl_cleanup_locked fs/overlayfs/dir.c:36 [inline]
ovl_cleanup+0x120/0x230 fs/overlayfs/dir.c:54
ovl_check_rename_whiteout fs/overlayfs/super.c:615 [inline]
ovl_make_workdir fs/overlayfs/super.c:713 [inline]
ovl_get_workdir fs/overlayfs/super.c:836 [inline]
ovl_fill_super_creds fs/overlayfs/super.c:1449 [inline]
ovl_fill_super+0x50b4/0x5d40 fs/overlayfs/super.c:1560
vfs_get_super fs/super.c:1273 [inline]
get_tree_nodev+0xbb/0x150 fs/super.c:1292
vfs_get_tree+0x92/0x2a0 fs/super.c:1700
fc_mount fs/namespace.c:1198 [inline]
do_new_mount_fc fs/namespace.c:3765 [inline]
do_new_mount+0x319/0xdc0 fs/namespace.c:3841
do_mount fs/namespace.c:4174 [inline]
__do_sys_mount fs/namespace.c:4390 [inline]
__se_sys_mount+0x31d/0x420 fs/namespace.c:4367
do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
do_syscall_64+0x174/0x580 arch/x86/entry/syscall_64.c:94
entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7fd12393e0d9
RSP: 002b:00007fd121b96028 EFLAGS: 00000246 ORIG_RAX: 00000000000000a5
RAX: ffffffffffffffda RBX: 00007fd123bc5fa0 RCX: 00007fd12393e0d9
RDX: 0000200000000440 RSI: 0000200000000100 RDI: 0000000000000000
RBP: 00007fd1239d5024 R08: 0000200000000200 R09: 0000000000000000
R10: 0000000000000008 R11: 0000000000000246 R12: 0000000000000000
R13: 00007fd123bc6038 R14: 00007fd123bc5fa0 R15: 00007ffd1e454ae8
Showing all locks held in the system:
3 locks held by kworker/u8:1/13:
3 locks held by kworker/u8:1/13:
#0: ffff88803238a138 ((wq_completion)ipv6_addrconf){+.+.}-{0:0}, at: process_one_work kernel/workqueue.c:3297 [inline]
#0: ffff88803238a138 ((wq_completion)ipv6_addrconf){+.+.}-{0:0}, at: process_scheduled_works+0xa20/0x14e0 kernel/workqueue.c:3405
#1: ffffc90000127c40 ((work_completion)(&(&net->ipv6.addr_chk_work)->work)){+.+.}-{0:0}, at: process_one_work kernel/workqueue.c:3297 [inline]
#1: ffffc90000127c40 ((work_completion)(&(&net->ipv6.addr_chk_work)->work)){+.+.}-{0:0}, at: process_scheduled_works+0xa20/0x14e0 kernel/workqueue.c:3405
#2: ffffffff8f5b25f8 (rtnl_mutex){+.+.}-{4:4}, at: rtnl_net_lock include/linux/rtnetlink.h:130 [inline]
#2: ffffffff8f5b25f8 (rtnl_mutex){+.+.}-{4:4}, at: addrconf_verify_work+0x19/0x30 net/ipv6/addrconf.c:4769
1 lock held by khungtaskd/37:
#0: ffffffff8e1c3000 (rcu_read_lock){....}-{1:3}, at: rcu_lock_acquire include/linux/rcupdate.h:300 [inline]
#0: ffffffff8e1c3000 (rcu_read_lock){....}-{1:3}, at: rcu_read_lock include/linux/rcupdate.h:840 [inline]
#0: ffffffff8e1c3000 (rcu_read_lock){....}-{1:3}, at: debug_show_all_locks+0x2e/0x180 kernel/locking/lockdep.c:6775
2 locks held by getty/5352:
#0: ffff8880355850a0 (&tty->ldisc_sem){++++}-{0:0}, at: tty_ldisc_ref_wait+0x25/0x70 drivers/tty/tty_ldisc.c:243
#1: ffffc90003cc62e0 (&ldata->atomic_read_lock){+.+.}-{4:4}, at: n_tty_read+0x460/0x1360 drivers/tty/n_tty.c:2211
5 locks held by syz.9.100/6807:
#0: ffff8880427140d0 (&type->s_umount_key#61/1){+.+.}-{4:4}, at: alloc_super fs/super.c:345 [inline]
#0: ffff8880427140d0 (&type->s_umount_key#61/1){+.+.}-{4:4}, at: sget_fc+0x938/0x1910 fs/super.c:766
#1: ffff8880379fa500 (sb_writers#18){.+.+}-{0:0}, at: mnt_want_write+0x41/0x90 fs/namespace.c:494
#2: ffff88803fe1bfa8 (&type->i_mutex_dir_key#11/1){+.+.}-{4:4}, at: inode_lock_nested include/linux/fs.h:1069 [inline]
#2: ffff88803fe1bfa8 (&type->i_mutex_dir_key#11/1){+.+.}-{4:4}, at: start_removing_dentry+0x4f/0x1c0 fs/namei.c:3596
#3: ffff88803fe1d2f8 (&sb->s_type->i_mutex_key#39){+.+.}-{4:4}, at: inode_lock include/linux/fs.h:1024 [inline]
#3: ffff88803fe1d2f8 (&sb->s_type->i_mutex_key#39){+.+.}-{4:4}, at: vfs_unlink+0xd5/0x6e0 fs/namei.c:5501
#4: ffff88803fe1cea8 (&jfs_ip->rdwrlock#3){++++}-{4:4}, at: jfs_unlink+0x1dc/0x9e0 fs/jfs/namei.c:489
1 lock held by udevd/7179:
1 lock held by dhcpcd/7925:
#0: ffff8880594c16f8 (&sb->s_type->i_mutex_key#12){+.+.}-{4:4}, at: inode_lock include/linux/fs.h:1024 [inline]
#0: ffff8880594c16f8 (&sb->s_type->i_mutex_key#12){+.+.}-{4:4}, at: __sock_release net/socket.c:709 [inline]
#0: ffff8880594c16f8 (&sb->s_type->i_mutex_key#12){+.+.}-{4:4}, at: sock_close+0x82/0x220 net/socket.c:1501
9 locks held by syz-executor/8299:
3 locks held by syz.0.298/8726:
4 locks held by syz.3.239/8723:
3 locks held by syz.2.302/8728:
1 lock held by syz-executor/8729:
#0: ffffffff8f5b25f8 (rtnl_mutex){+.+.}-{4:4}, at: rtnl_net_lock include/linux/rtnetlink.h:130 [inline]
#0: ffffffff8f5b25f8 (rtnl_mutex){+.+.}-{4:4}, at: inet_rtm_newaddr+0x464/0x19e0 net/ipv4/devinet.c:978
1 lock held by dhcpcd-run-hook/8735:
=============================================
NMI backtrace for cpu 1
CPU: 1 UID: 0 PID: 37 Comm: khungtaskd Not tainted syzkaller #0 PREEMPT_{RT,(full)}
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/24/2026
Call Trace:
dump_stack_lvl+0xe8/0x150 lib/dump_stack.c:120
nmi_cpu_backtrace+0x274/0x2d0 lib/nmi_backtrace.c:122
nmi_trigger_cpumask_backtrace+0x17a/0x380 lib/nmi_backtrace.c:65
trigger_all_cpu_backtrace include/linux/nmi.h:162 [inline]
__sys_info lib/sys_info.c:157 [inline]
sys_info+0x135/0x170 lib/sys_info.c:165
check_hung_uninterruptible_tasks kernel/hung_task.c:353 [inline]
watchdog+0xfd7/0x1030 kernel/hung_task.c:561
kthread+0x388/0x470 kernel/kthread.c:436
ret_from_fork+0x514/0xb70 arch/x86/kernel/process.c:158
ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245
Sending NMI from CPU 1 to CPUs 0:
NMI backtrace for cpu 0
CPU: 0 UID: 0 PID: 8728 Comm: syz.2.302 Not tainted syzkaller #0 PREEMPT_{RT,(full)}
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/24/2026
RIP: 0010:clear_pages arch/x86/include/asm/page_64.h:103 [inline]
RIP: 0010:clear_highpages_kasan_tagged mm/page_alloc.c:1221 [inline]
RIP: 0010:post_alloc_hook+0x115/0x250 mm/page_alloc.c:1857
Code: 48 c1 e8 03 42 80 3c 28 00 74 0c 48 c7 c7 00 5f b3 8d e8 7e bf 0e 00 4c 03 25 77 d1 92 0b 44 89 f9 48 c1 e1 0c 31 c0 4c 89 e7 aa 0f 1f 44 00 00 e8 8f 87 0e 00 e9 c4 00 00 00 e9 d3 00 00 00
RSP: 0018:ffffc90003c8f590 EFLAGS: 00010246
RAX: 0000000000000000 RBX: 0000000000000000 RCX: 0000000000000240
RDX: 0000000000000000 RSI: 0000000000000000 RDI: ffff888069ef6dc0
RBP: 0000000000140cca R08: ffffffff8fafa337 R09: 0000000000000000
R10: ffffed100d3dec00 R11: fffffbfff1f5f467 R12: ffff888069ef6000
R13: dffffc0000000000 R14: ffffea0001a7bd80 R15: 0000000000000001
FS: 00007f93bdc566c0(0000) GS:ffff888125c3e000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007fa236dd7000 CR3: 000000003860e000 CR4: 00000000003526f0
Call Trace:
prep_new_page mm/page_alloc.c:1867 [inline]
get_page_from_freelist+0x262a/0x26a0 mm/page_alloc.c:3946
__alloc_frozen_pages_noprof+0x18d/0x380 mm/page_alloc.c:5304
alloc_pages_mpol+0xce/0x280 mm/mempolicy.c:2490
folio_alloc_mpol_noprof+0x3b/0x1e0 mm/mempolicy.c:2509
shmem_alloc_folio mm/shmem.c:1917 [inline]
shmem_alloc_and_add_folio mm/shmem.c:1959 [inline]
shmem_get_folio_gfp+0x6ee/0x1c40 mm/shmem.c:2512
shmem_get_folio mm/shmem.c:2618 [inline]
shmem_write_begin+0x166/0x320 mm/shmem.c:3249
generic_perform_write+0x2ad/0x8b0 mm/filemap.c:4358
shmem_file_write_iter+0xfb/0x120 mm/shmem.c:3424
new_sync_write fs/read_write.c:595 [inline]
vfs_write+0x61e/0xbb0 fs/read_write.c:687
ksys_write+0x156/0x270 fs/read_write.c:739
do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
do_syscall_64+0x174/0x580 arch/x86/entry/syscall_64.c:94
entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f93bf9be90e
Code: 08 0f 85 a5 a8 ff ff 49 89 fb 48 89 f0 48 89 d7 48 89 ce 4c 89 c2 4d 89 ca 4c 8b 44 24 08 4c 8b 4c 24 10 4c 89 5c 24 08 0f 05 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 80 00 00 00 00 48 83 ec 08
RSP: 002b:00007f93bdc55da8 EFLAGS: 00000246 ORIG_RAX: 0000000000000001
RAX: ffffffffffffffda RBX: 00007f93bdc566c0 RCX: 00007f93bf9be90e
RDX: 0000000001000000 RSI: 00007f93b5836000 RDI: 0000000000000003
RBP: 0000000000000000 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000003
R13: 00007f93bdc55ee0 R14: 00007f93bdc55ea0 R15: 00007f93b5836000