INFO: task syz.3.20:6637 blocked for more than 143 seconds.
Not tainted syzkaller #0
Blocked by coredump.
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz.3.20 state:D stack:26776 pid:6637 tgid:6637 ppid:6276 task_flags:0x40044c flags:0x00004004
Call Trace:
context_switch kernel/sched/core.c:5357 [inline]
__schedule+0x1742/0x4c30 kernel/sched/core.c:6961
__schedule_loop kernel/sched/core.c:7043 [inline]
schedule+0x165/0x360 kernel/sched/core.c:7058
schedule_preempt_disabled+0x13/0x30 kernel/sched/core.c:7115
rwsem_down_write_slowpath+0x926/0x10e0 kernel/locking/rwsem.c:1185
__down_write_common kernel/locking/rwsem.c:1317 [inline]
__down_write kernel/locking/rwsem.c:1326 [inline]
down_write+0x1ab/0x1f0 kernel/locking/rwsem.c:1591
mmap_write_lock include/linux/mmap_lock.h:397 [inline]
exit_mmap+0x28b/0xb30 mm/mmap.c:1288
__mmput+0x118/0x420 kernel/fork.c:1129
exit_mm+0x1da/0x2c0 kernel/exit.c:582
do_exit+0x648/0x22f0 kernel/exit.c:949
do_group_exit+0x21c/0x2d0 kernel/exit.c:1102
get_signal+0x1252/0x1300 kernel/signal.c:3034
arch_do_signal_or_restart+0x9a/0x750 arch/x86/kernel/signal.c:337
exit_to_user_mode_loop+0x75/0x110 kernel/entry/common.c:40
exit_to_user_mode_prepare include/linux/irq-entry-common.h:225 [inline]
syscall_exit_to_user_mode_work include/linux/entry-common.h:175 [inline]
syscall_exit_to_user_mode include/linux/entry-common.h:210 [inline]
do_syscall_64+0x217/0x300 arch/x86/entry/syscall_64.c:100
entry_SYSCALL_64_after_hwframe+0x76/0x7e
RIP: 0033:0x7fa45ad8ef03
RSP: 002b:00007ffd35ba4898 EFLAGS: 00000246 ORIG_RAX: 0000000000000009
RAX: fffffffffffffffc RBX: 00007fa45abff6c0 RCX: 00007fa45ad8ef03
RDX: 0000000000000000 RSI: 0000000000021000 RDI: 0000000000000000
RBP: 0000000000000000 R08: 00000000ffffffff R09: 0000000000000000
R10: 0000000000020022 R11: 0000000000000246 R12: 00007ffd35ba49f0
R13: ffffffffffffffc0 R14: 0000000000001000 R15: 0000000000000000
INFO: task syz.3.20:6637 is blocked on an rw-semaphore, but the owner is not found.
INFO: task syz.0.40:6639 blocked for more than 143 seconds.
Not tainted syzkaller #0
Blocked by coredump.
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz.0.40 state:D stack:25768 pid:6639 tgid:6638 ppid:6274 task_flags:0x40054c flags:0x00004000
Call Trace:
context_switch kernel/sched/core.c:5357 [inline]
__schedule+0x1742/0x4c30 kernel/sched/core.c:6961
__schedule_loop kernel/sched/core.c:7043 [inline]
schedule+0x165/0x360 kernel/sched/core.c:7058
schedule_preempt_disabled+0x13/0x30 kernel/sched/core.c:7115
rwsem_down_write_slowpath+0x926/0x10e0 kernel/locking/rwsem.c:1185
__down_write_common kernel/locking/rwsem.c:1317 [inline]
__down_write kernel/locking/rwsem.c:1326 [inline]
down_write+0x1ab/0x1f0 kernel/locking/rwsem.c:1591
mmap_write_lock include/linux/mmap_lock.h:397 [inline]
exit_mmap+0x28b/0xb30 mm/mmap.c:1288
__mmput+0x118/0x420 kernel/fork.c:1129
exit_mm+0x1da/0x2c0 kernel/exit.c:582
do_exit+0x648/0x22f0 kernel/exit.c:949
do_group_exit+0x21c/0x2d0 kernel/exit.c:1102
get_signal+0x1252/0x1300 kernel/signal.c:3034
arch_do_signal_or_restart+0x9a/0x750 arch/x86/kernel/signal.c:337
exit_to_user_mode_loop+0x75/0x110 kernel/entry/common.c:40
exit_to_user_mode_prepare include/linux/irq-entry-common.h:225 [inline]
syscall_exit_to_user_mode_work include/linux/entry-common.h:175 [inline]
syscall_exit_to_user_mode include/linux/entry-common.h:210 [inline]
do_syscall_64+0x217/0x300 arch/x86/entry/syscall_64.c:100
entry_SYSCALL_64_after_hwframe+0x76/0x7e
RIP: 0033:0x7fe72058eec9
RSP: 002b:00007fe72147e0e8 EFLAGS: 00000246 ORIG_RAX: 00000000000000ca
RAX: fffffffffffffe00 RBX: 00007fe7207e5fa8 RCX: 00007fe72058eec9
RDX: 0000000000000000 RSI: 0000000000000080 RDI: 00007fe7207e5fa8
RBP: 00007fe7207e5fa0 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007fe7207e6038 R14: 00007ffd50e82720 R15: 00007ffd50e82808
INFO: task syz.0.40:6639 is blocked on an rw-semaphore, but the owner is not found.
INFO: task syz.2.41:6641 blocked for more than 144 seconds.
Not tainted syzkaller #0
Blocked by coredump.
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz.2.41 state:D stack:25768 pid:6641 tgid:6640 ppid:6280 task_flags:0x40054c flags:0x00004000
Call Trace:
context_switch kernel/sched/core.c:5357 [inline]
__schedule+0x1742/0x4c30 kernel/sched/core.c:6961
__schedule_loop kernel/sched/core.c:7043 [inline]
schedule+0x165/0x360 kernel/sched/core.c:7058
schedule_preempt_disabled+0x13/0x30 kernel/sched/core.c:7115
rwsem_down_write_slowpath+0x926/0x10e0 kernel/locking/rwsem.c:1185
__down_write_common kernel/locking/rwsem.c:1317 [inline]
__down_write kernel/locking/rwsem.c:1326 [inline]
down_write+0x1ab/0x1f0 kernel/locking/rwsem.c:1591
mmap_write_lock include/linux/mmap_lock.h:397 [inline]
exit_mmap+0x28b/0xb30 mm/mmap.c:1288
__mmput+0x118/0x420 kernel/fork.c:1129
exit_mm+0x1da/0x2c0 kernel/exit.c:582
do_exit+0x648/0x22f0 kernel/exit.c:949
do_group_exit+0x21c/0x2d0 kernel/exit.c:1102
get_signal+0x1252/0x1300 kernel/signal.c:3034
arch_do_signal_or_restart+0x9a/0x750 arch/x86/kernel/signal.c:337
exit_to_user_mode_loop+0x75/0x110 kernel/entry/common.c:40
exit_to_user_mode_prepare include/linux/irq-entry-common.h:225 [inline]
syscall_exit_to_user_mode_work include/linux/entry-common.h:175 [inline]
syscall_exit_to_user_mode include/linux/entry-common.h:210 [inline]
do_syscall_64+0x217/0x300 arch/x86/entry/syscall_64.c:100
entry_SYSCALL_64_after_hwframe+0x76/0x7e
RIP: 0033:0x7f2c0c98eec9
RSP: 002b:00007f2c0d77c0e8 EFLAGS: 00000246 ORIG_RAX: 00000000000000ca
RAX: fffffffffffffe00 RBX: 00007f2c0cbe5fa8 RCX: 00007f2c0c98eec9
RDX: 0000000000000000 RSI: 0000000000000080 RDI: 00007f2c0cbe5fa8
RBP: 00007f2c0cbe5fa0 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f2c0cbe6038 R14: 00007ffdbc19df70 R15: 00007ffdbc19e058
INFO: task syz.2.41:6641 is blocked on an rw-semaphore, but the owner is not found.
Showing all locks held in the system:
3 locks held by kworker/u8:0/12:
1 lock held by khungtaskd/30:
#0: ffffffff8db372a0 (rcu_read_lock){....}-{1:3}, at: rcu_lock_acquire include/linux/rcupdate.h:331 [inline]
#0: ffffffff8db372a0 (rcu_read_lock){....}-{1:3}, at: rcu_read_lock include/linux/rcupdate.h:841 [inline]
#0: ffffffff8db372a0 (rcu_read_lock){....}-{1:3}, at: debug_show_all_locks+0x2e/0x180 kernel/locking/lockdep.c:6775
2 locks held by udevd/5094:
#0: ffffffff8dbeb330 (dup_mmap_sem){.+.+}-{0:0}, at: dup_mm kernel/fork.c:1484 [inline]
#0: ffffffff8dbeb330 (dup_mmap_sem){.+.+}-{0:0}, at: copy_mm+0x131/0x4b0 kernel/fork.c:1537
#1: ffff8880759e2220 (&mm->mmap_lock){++++}-{4:4}, at: mmap_write_lock_killable include/linux/mmap_lock.h:415 [inline]
#1: ffff8880759e2220 (&mm->mmap_lock){++++}-{4:4}, at: dup_mmap+0x12d/0x1c50 mm/mmap.c:1727
2 locks held by getty/5484:
#0: ffff888031bcb0a0 (&tty->ldisc_sem){++++}-{0:0}, at: tty_ldisc_ref_wait+0x25/0x70 drivers/tty/tty_ldisc.c:243
#1: ffffc9000331e2f0 (&ldata->atomic_read_lock){+.+.}-{4:4}, at: n_tty_read+0x5ce/0x1ab0 drivers/tty/n_tty.c:2222
1 lock held by syz-execprog/6127:
#0: ffff888026fe6d60 (&mm->mmap_lock){++++}-{4:4}, at: mmap_write_lock_killable include/linux/mmap_lock.h:415 [inline]
#0: ffff888026fe6d60 (&mm->mmap_lock){++++}-{4:4}, at: vm_mmap_pgoff+0x211/0x4d0 mm/util.c:578
1 lock held by syz-executor/6133:
#0: ffff88807a86d7e0 (&mm->mmap_lock){++++}-{4:4}, at: mmap_write_lock_killable include/linux/mmap_lock.h:415 [inline]
#0: ffff88807a86d7e0 (&mm->mmap_lock){++++}-{4:4}, at: vm_mmap_pgoff+0x211/0x4d0 mm/util.c:578
1 lock held by syz-executor/6274:
#0: ffff888028714260 (&mm->mmap_lock){++++}-{4:4}, at: mmap_write_lock include/linux/mmap_lock.h:397 [inline]
#0: ffff888028714260 (&mm->mmap_lock){++++}-{4:4}, at: exit_mmap+0x28b/0xb30 mm/mmap.c:1288
1 lock held by syz-executor/6276:
#0: ffff888076409760 (&mm->mmap_lock){++++}-{4:4}, at: mmap_write_lock include/linux/mmap_lock.h:397 [inline]
#0: ffff888076409760 (&mm->mmap_lock){++++}-{4:4}, at: exit_mmap+0x28b/0xb30 mm/mmap.c:1288
1 lock held by syz-executor/6282:
#0: ffff888028712220 (&mm->mmap_lock){++++}-{4:4}, at: mmap_write_lock include/linux/mmap_lock.h:397 [inline]
#0: ffff888028712220 (&mm->mmap_lock){++++}-{4:4}, at: exit_mmap+0x28b/0xb30 mm/mmap.c:1288
1 lock held by syz-executor/6283:
#0: ffff888076408ca0 (&mm->mmap_lock){++++}-{4:4}, at: mmap_write_lock include/linux/mmap_lock.h:397 [inline]
#0: ffff888076408ca0 (&mm->mmap_lock){++++}-{4:4}, at: exit_mmap+0x28b/0xb30 mm/mmap.c:1288
5 locks held by kworker/u8:8/6558:
#0: ffff8880b8839f98 (&rq->__lock){-.-.}-{2:2}, at: raw_spin_rq_lock_nested+0x2a/0x140 kernel/sched/core.c:636
#1: ffff8880b8824008 (psi_seq){-.-.}-{0:0}, at: psi_sched_switch kernel/sched/stats.h:220 [inline]
#1: ffff8880b8824008 (psi_seq){-.-.}-{0:0}, at: __schedule+0x2270/0x4c30 kernel/sched/core.c:6955
#2: ffff88801d6e8768 (&rdev->wiphy.mtx){+.+.}-{4:4}, at: class_wiphy_constructor include/net/cfg80211.h:6212 [inline]
#2: ffff88801d6e8768 (&rdev->wiphy.mtx){+.+.}-{4:4}, at: cfg80211_wiphy_work+0xc4/0x460 net/wireless/core.c:421
#3: ffffffff8db372a0 (rcu_read_lock){....}-{1:3}, at: rcu_lock_acquire include/linux/rcupdate.h:331 [inline]
#3: ffffffff8db372a0 (rcu_read_lock){....}-{1:3}, at: rcu_read_lock include/linux/rcupdate.h:841 [inline]
#3: ffffffff8db372a0 (rcu_read_lock){....}-{1:3}, at: ieee80211_sta_active_ibss+0xc3/0x330 net/mac80211/ibss.c:635
#4: ffffffff8db372a0 (rcu_read_lock){....}-{1:3}, at: rcu_lock_acquire include/linux/rcupdate.h:331 [inline]
#4: ffffffff8db372a0 (rcu_read_lock){....}-{1:3}, at: rcu_read_lock include/linux/rcupdate.h:841 [inline]
#4: ffffffff8db372a0 (rcu_read_lock){....}-{1:3}, at: class_rcu_constructor include/linux/rcupdate.h:1155 [inline]
#4: ffffffff8db372a0 (rcu_read_lock){....}-{1:3}, at: unwind_next_frame+0xa5/0x2390 arch/x86/kernel/unwind_orc.c:479
1 lock held by syz.3.20/6637:
#0: ffff88807606cd20 (&mm->mmap_lock){++++}-{4:4}, at: mmap_write_lock include/linux/mmap_lock.h:397 [inline]
#0: ffff88807606cd20 (&mm->mmap_lock){++++}-{4:4}, at: exit_mmap+0x28b/0xb30 mm/mmap.c:1288
1 lock held by syz.0.40/6639:
#0: ffff88807606d7e0 (&mm->mmap_lock){++++}-{4:4}, at: mmap_write_lock include/linux/mmap_lock.h:397 [inline]
#0: ffff88807606d7e0 (&mm->mmap_lock){++++}-{4:4}, at: exit_mmap+0x28b/0xb30 mm/mmap.c:1288
1 lock held by syz.2.41/6641:
#0: ffff88807640a220 (&mm->mmap_lock){++++}-{4:4}, at: mmap_write_lock include/linux/mmap_lock.h:397 [inline]
#0: ffff88807640a220 (&mm->mmap_lock){++++}-{4:4}, at: exit_mmap+0x28b/0xb30 mm/mmap.c:1288
1 lock held by rm/6642:
#0: ffff88807606ed60 (&mm->mmap_lock){++++}-{4:4}, at: mmap_write_lock_killable include/linux/mmap_lock.h:415 [inline]
#0: ffff88807606ed60 (&mm->mmap_lock){++++}-{4:4}, at: vm_mmap_pgoff+0x211/0x4d0 mm/util.c:578
1 lock held by syz-executor/6648:
#0: ffff888019874260 (&mm->mmap_lock){++++}-{4:4}, at: mmap_write_lock include/linux/mmap_lock.h:397 [inline]
#0: ffff888019874260 (&mm->mmap_lock){++++}-{4:4}, at: exit_mmap+0x28b/0xb30 mm/mmap.c:1288
1 lock held by udevd/6656:
#0: ffff888057c062a0 (&mm->mmap_lock){++++}-{4:4}, at: mmap_write_lock_killable include/linux/mmap_lock.h:415 [inline]
#0: ffff888057c062a0 (&mm->mmap_lock){++++}-{4:4}, at: __vm_munmap+0x15c/0x3d0 mm/vma.c:3152
1 lock held by udevd/6664:
#0: ffff88802e9ae2a0 (&mm->mmap_lock){++++}-{4:4}, at: mmap_write_lock_killable include/linux/mmap_lock.h:415 [inline]
#0: ffff88802e9ae2a0 (&mm->mmap_lock){++++}-{4:4}, at: __vm_munmap+0x15c/0x3d0 mm/vma.c:3152
1 lock held by syz.6.51/6789:
#0: ffff888076951760 (&mm->mmap_lock){++++}-{4:4}, at: mmap_write_lock include/linux/mmap_lock.h:397 [inline]
#0: ffff888076951760 (&mm->mmap_lock){++++}-{4:4}, at: exit_mmap+0x28b/0xb30 mm/mmap.c:1288
1 lock held by syz.9.56/6803:
#0: ffff88807640c260 (&mm->mmap_lock){++++}-{4:4}, at: mmap_write_lock include/linux/mmap_lock.h:397 [inline]
#0: ffff88807640c260 (&mm->mmap_lock){++++}-{4:4}, at: exit_mmap+0x28b/0xb30 mm/mmap.c:1288
1 lock held by syz.7.44/6804:
#0: ffff88807640b7a0 (&mm->mmap_lock){++++}-{4:4}, at: mmap_write_lock include/linux/mmap_lock.h:397 [inline]
#0: ffff88807640b7a0 (&mm->mmap_lock){++++}-{4:4}, at: exit_mmap+0x28b/0xb30 mm/mmap.c:1288
=============================================
NMI backtrace for cpu 1
CPU: 1 UID: 0 PID: 30 Comm: khungtaskd Not tainted syzkaller #0 PREEMPT(full)
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 08/18/2025
Call Trace:
dump_stack_lvl+0x189/0x250 lib/dump_stack.c:120
nmi_cpu_backtrace+0x39e/0x3d0 lib/nmi_backtrace.c:113
nmi_trigger_cpumask_backtrace+0x17a/0x2e0 lib/nmi_backtrace.c:62
trigger_all_cpu_backtrace include/linux/nmi.h:160 [inline]
check_hung_uninterruptible_tasks kernel/hung_task.c:328 [inline]
watchdog+0x15af/0x15f0 kernel/hung_task.c:491
kthread+0x711/0x890 kernel/kthread.c:463
ret_from_fork+0x435/0x7c0 arch/x86/kernel/process.c:148
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: 0 Comm: swapper/0 Not tainted syzkaller #0 PREEMPT(full)
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 08/18/2025
RIP: 0010:check_preemption_disabled+0x40/0x110 lib/smp_processor_id.c:53
Code: 08 65 8b 05 c6 60 0f 07 65 8b 0d bb 60 0f 07 f7 c1 ff ff ff 7f 74 23 65 48 8b 0d 9b 60 0f 07 48 3b 4c 24 08 0f 85 ca 00 00 00 <48> 83 c4 10 5b 41 5e 41 5f 5d e9 41 ce 02 00 cc 48 c7 04 24 00 00
RSP: 0018:ffffc900000075d8 EFLAGS: 00000046
RAX: 0000000000000000 RBX: 0000000000000002 RCX: 448d6a3569860000
RDX: 0000000000000003 RSI: ffffffff8d420ba4 RDI: ffffffff8b7dac80
RBP: ffffffff8d895c70 R08: ffffffff8d807ef8 R09: 0000000000000000
R10: ffffc90000007798 R11: fffff52000000ef5 R12: 0000000000000003
R13: 0000000000000003 R14: ffffffff8db372a0 R15: ffffffff8d895100
FS: 0000000000000000(0000) GS:ffff8881266f3000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f27681ffffc CR3: 00000000713c2000 CR4: 00000000003526f0
Call Trace:
lockdep_recursion_finish kernel/locking/lockdep.c:470 [inline]
lock_release+0x27c/0x3d0 kernel/locking/lockdep.c:5891
rcu_lock_release include/linux/rcupdate.h:341 [inline]
rcu_read_unlock include/linux/rcupdate.h:871 [inline]
class_rcu_destructor include/linux/rcupdate.h:1155 [inline]
unwind_next_frame+0x19a9/0x2390 arch/x86/kernel/unwind_orc.c:680
arch_stack_walk+0x11c/0x150 arch/x86/kernel/stacktrace.c:25
stack_trace_save+0x9c/0xe0 kernel/stacktrace.c:122
kasan_save_stack+0x3e/0x60 mm/kasan/common.c:47
kasan_record_aux_stack+0x99/0xb0 mm/kasan/generic.c:548
insert_work+0x3d/0x320 kernel/workqueue.c:2184
__queue_work+0xba9/0xfa0 kernel/workqueue.c:2343
call_timer_fn+0x17e/0x5e0 kernel/time/timer.c:1747
expire_timers kernel/time/timer.c:1793 [inline]
__run_timers kernel/time/timer.c:2372 [inline]
__run_timer_base+0x646/0x860 kernel/time/timer.c:2384
run_timer_base kernel/time/timer.c:2393 [inline]
run_timer_softirq+0xb7/0x180 kernel/time/timer.c:2403
handle_softirqs+0x286/0x860 kernel/softirq.c:579
__do_softirq kernel/softirq.c:613 [inline]
invoke_softirq kernel/softirq.c:453 [inline]
__irq_exit_rcu+0xca/0x1f0 kernel/softirq.c:680
irq_exit_rcu+0x9/0x30 kernel/softirq.c:696
instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1050 [inline]
sysvec_apic_timer_interrupt+0xa4/0xc0 arch/x86/kernel/apic/apic.c:1050
asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:702
RIP: 0010:pv_native_safe_halt+0x13/0x20 arch/x86/kernel/paravirt.c:82
Code: cc cc cc cc cc cc cc 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 f3 0f 1e fa 66 90 0f 00 2d a3 ca 24 00 f3 0f 1e fa fb f4 cc cc cc cc cc cc cc cc cc cc cc cc 90 90 90 90 90 90 90 90 90
RSP: 0018:ffffffff8d807d80 EFLAGS: 000002c2
RAX: 448d6a3569860000 RBX: ffffffff81935d28 RCX: 448d6a3569860000
RDX: 0000000000000001 RSI: ffffffff8d254c7f RDI: ffffffff8b7dac80
RBP: ffffffff8d807eb8 R08: ffff8880b8832f9b R09: 1ffff110171065f3
R10: dffffc0000000000 R11: ffffed10171065f4 R12: ffffffff8f32ac70
R13: 0000000000000000 R14: 0000000000000000 R15: 1ffffffff1b12a20
arch_safe_halt arch/x86/include/asm/paravirt.h:107 [inline]
default_idle+0x13/0x20 arch/x86/kernel/process.c:757
default_idle_call+0x72/0xb0 kernel/sched/idle.c:122
cpuidle_idle_call kernel/sched/idle.c:190 [inline]
do_idle+0x1e8/0x510 kernel/sched/idle.c:330
cpu_startup_entry+0x44/0x60 kernel/sched/idle.c:428
rest_init+0x2de/0x300 init/main.c:744
start_kernel+0x3a9/0x410 init/main.c:1097
x86_64_start_reservations+0x24/0x30 arch/x86/kernel/head64.c:307
x86_64_start_kernel+0x17c/0x200 arch/x86/kernel/head64.c:288
common_startup_64+0x13e/0x147