INFO: task syz.6.2721:16833 blocked for more than 143 seconds.
Not tainted syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz.6.2721 state:D stack:24968 pid:16833 ppid:15111 flags:0x00004006
Call Trace:
context_switch kernel/sched/core.c:5381 [inline]
__schedule+0x1553/0x45a0 kernel/sched/core.c:6700
schedule+0xbd/0x170 kernel/sched/core.c:6774
io_schedule+0x80/0xd0 kernel/sched/core.c:9023
folio_wait_bit_common+0x714/0xfa0 mm/filemap.c:1329
folio_wait_locked include/linux/pagemap.h:1149 [inline]
gfs2_jhead_process_page+0x17e/0x720 fs/gfs2/lops.c:477
gfs2_find_jhead+0xbe5/0xd20 fs/gfs2/lops.c:594
gfs2_make_fs_rw+0x20d/0x580 fs/gfs2/super.c:144
gfs2_fill_super+0x1914/0x1f30 fs/gfs2/ops_fstype.c:1291
get_tree_bdev+0x3f3/0x520 fs/super.c:1591
gfs2_get_tree+0x51/0x1e0 fs/gfs2/ops_fstype.c:1344
vfs_get_tree+0x8c/0x280 fs/super.c:1764
do_new_mount+0x24b/0xa40 fs/namespace.c:3386
do_mount fs/namespace.c:3726 [inline]
__do_sys_mount fs/namespace.c:3935 [inline]
__se_sys_mount+0x2e7/0x3d0 fs/namespace.c:3912
do_syscall_x64 arch/x86/entry/common.c:46 [inline]
do_syscall_64+0x55/0xa0 arch/x86/entry/common.c:76
entry_SYSCALL_64_after_hwframe+0x68/0xd2
RIP: 0033:0x7f1897f9da0a
RSP: 002b:00007f1898ef1e58 EFLAGS: 00000246 ORIG_RAX: 00000000000000a5
RAX: ffffffffffffffda RBX: 00007f1898ef1ee0 RCX: 00007f1897f9da0a
RDX: 0000200000037f40 RSI: 00002000000008c0 RDI: 00007f1898ef1ea0
RBP: 0000200000037f40 R08: 00007f1898ef1ee0 R09: 0000000001010084
R10: 0000000001010084 R11: 0000000000000246 R12: 00002000000008c0
R13: 00007f1898ef1ea0 R14: 0000000000037f86 R15: 0000200000000480
Showing all locks held in the system:
1 lock held by khungtaskd/28:
#0: ffffffff8d132060 (rcu_read_lock){....}-{1:2}, at: rcu_lock_acquire include/linux/rcupdate.h:334 [inline]
#0: ffffffff8d132060 (rcu_read_lock){....}-{1:2}, at: rcu_read_lock include/linux/rcupdate.h:786 [inline]
#0: ffffffff8d132060 (rcu_read_lock){....}-{1:2}, at: debug_show_all_locks+0x55/0x290 kernel/locking/lockdep.c:6633
2 locks held by kworker/u4:5/62:
2 locks held by klogd/5126:
2 locks held by getty/5526:
#0: ffff88803182a0a0 (&tty->ldisc_sem){++++}-{0:0}, at: tty_ldisc_ref_wait+0x25/0x70 drivers/tty/tty_ldisc.c:243
#1: ffffc9000326e2f0 (&ldata->atomic_read_lock){+.+.}-{3:3}, at: n_tty_read+0x433/0x1390 drivers/tty/n_tty.c:2217
3 locks held by kworker/1:3/5756:
#0: ffff8880196f9938 ((wq_completion)usb_hub_wq){+.+.}-{0:0}, at: process_one_work kernel/workqueue.c:2628 [inline]
#0: ffff8880196f9938 ((wq_completion)usb_hub_wq){+.+.}-{0:0}, at: process_scheduled_works+0x96f/0x15d0 kernel/workqueue.c:2730
#1: ffffc9000455fd00 ((work_completion)(&hub->events)){+.+.}-{0:0}, at: process_one_work kernel/workqueue.c:2628 [inline]
#1: ffffc9000455fd00 ((work_completion)(&hub->events)){+.+.}-{0:0}, at: process_scheduled_works+0x96f/0x15d0 kernel/workqueue.c:2730
#2: ffff888143337218 (&dev->power.lock){-...}-{2:2}, at: spin_lock_irq include/linux/spinlock.h:376 [inline]
#2: ffff888143337218 (&dev->power.lock){-...}-{2:2}, at: rpm_idle+0x5c9/0x910 drivers/base/power/runtime.c:527
1 lock held by syz.6.2721/16833:
#0: ffff88807ba200e0 (&type->s_umount_key#106){+.+.}-{3:3}, at: __super_lock fs/super.c:56 [inline]
#0: ffff88807ba200e0 (&type->s_umount_key#106){+.+.}-{3:3}, at: __super_lock_excl fs/super.c:71 [inline]
#0: ffff88807ba200e0 (&type->s_umount_key#106){+.+.}-{3:3}, at: get_tree_bdev+0x353/0x520 fs/super.c:1589
2 locks held by dhcpcd-run-hook/18284:
=============================================
NMI backtrace for cpu 1
CPU: 1 PID: 28 Comm: khungtaskd Not tainted syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/12/2026
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+0xf3d/0xf80 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: 9510 Comm: kworker/u4:14 Not tainted syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/12/2026
Workqueue: events_unbound nsim_dev_trap_report_work
RIP: 0010:on_stack arch/x86/include/asm/stacktrace.h:-1 [inline]
RIP: 0010:unwind_next_frame+0x1cac/0x2970 arch/x86/kernel/unwind_orc.c:665
Code: 74 05 e8 a7 f8 a3 00 49 8b 5c 24 08 4d 8d 7c 24 10 4c 89 f8 48 c1 e8 03 42 80 3c 28 00 74 08 4c 89 ff e8 87 f8 a3 00 49 8b 07 <4c> 39 f3 0f 96 c1 4c 39 f0 0f 97 c2 84 d1 74 3c 49 8d 4e 08 48 39
RSP: 0018:ffffc9000cebf578 EFLAGS: 00000246
RAX: ffffc9000cec0000 RBX: ffffc9000ceb8000 RCX: 0000000000000000
RDX: ffff888028fcda00 RSI: 0000000000000001 RDI: ffffc9000cebf650
RBP: ffffc9000cebfa40 R08: ffff888028fcda00 R09: 0000000000000003
R10: 0000000000000004 R11: 0000000000000000 R12: ffffc9000cebf648
R13: dffffc0000000000 R14: ffffc9000cebfa88 R15: ffffc9000cebf658
FS: 0000000000000000(0000) GS:ffff8880b8e00000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f6592b49a10 CR3: 000000000cf32000 CR4: 00000000003506f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000600
Call Trace:
arch_stack_walk+0x144/0x190 arch/x86/kernel/stacktrace.c:25
stack_trace_save+0xaa/0x100 kernel/stacktrace.c:122
kasan_save_stack mm/kasan/common.c:46 [inline]
kasan_set_track+0x4e/0x70 mm/kasan/common.c:53
____kasan_kmalloc mm/kasan/common.c:375 [inline]
__kasan_kmalloc+0x8f/0xa0 mm/kasan/common.c:384
kasan_kmalloc include/linux/kasan.h:198 [inline]
__do_kmalloc_node mm/slab_common.c:1007 [inline]
__kmalloc_node_track_caller+0xb2/0x230 mm/slab_common.c:1027
kmalloc_reserve+0x116/0x240 net/core/skbuff.c:584
__alloc_skb+0x138/0x2c0 net/core/skbuff.c:653
alloc_skb include/linux/skbuff.h:1316 [inline]
nsim_dev_trap_skb_build drivers/net/netdevsim/dev.c:748 [inline]
nsim_dev_trap_report drivers/net/netdevsim/dev.c:805 [inline]
nsim_dev_trap_report_work+0x293/0xb00 drivers/net/netdevsim/dev.c:851
process_one_work kernel/workqueue.c:2653 [inline]
process_scheduled_works+0xa5d/0x15d0 kernel/workqueue.c:2730
worker_thread+0xa55/0xfc0 kernel/workqueue.c:2811
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