INFO: task syz-executor:6343 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-executor state:D stack:21520 pid:6343 tgid:6343 ppid:1 task_flags:0x40054c flags:0x00004004 Call Trace: context_switch kernel/sched/core.c:5357 [inline] __schedule+0x1794/0x4c40 kernel/sched/core.c:6961 __schedule_loop kernel/sched/core.c:7043 [inline] schedule+0x161/0x360 kernel/sched/core.c:7058 schedule_preempt_disabled+0xf/0x20 kernel/sched/core.c:7115 rwsem_down_write_slowpath+0x922/0x10d0 kernel/locking/rwsem.c:1185 __down_write_common kernel/locking/rwsem.c:1317 [inline] __down_write kernel/locking/rwsem.c:1326 [inline] down_write+0x1a7/0x1f0 kernel/locking/rwsem.c:1591 mmap_write_lock include/linux/mmap_lock.h:397 [inline] exit_mmap+0x28a/0xb10 mm/mmap.c:1288 __mmput+0x118/0x430 kernel/fork.c:1129 exit_mm+0x1d6/0x2b0 kernel/exit.c:582 do_exit+0x644/0x22f0 kernel/exit.c:949 do_group_exit+0x218/0x2d0 kernel/exit.c:1102 get_signal+0x125a/0x1310 kernel/signal.c:3034 arch_do_signal_or_restart+0x96/0x750 arch/x86/kernel/signal.c:337 exit_to_user_mode_loop+0x71/0x110 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+0x213/0x2e0 arch/x86/entry/syscall_64.c:100 entry_SYSCALL_64_after_hwframe+0x76/0x7e RIP: 0033:0x7f8673b85613 RSP: 002b:00007fffad85bbe8 EFLAGS: 00000246 ORIG_RAX: 0000000000000038 RAX: fffffffffffffff4 RBX: 0000000000000000 RCX: 00007f8673b85613 RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000001200011 RBP: 0000000000000001 R08: 0000000000000000 R09: 0000000000000001 R10: 0000555577a487d0 R11: 0000000000000246 R12: 0000000000000000 R13: 00007f8673db1280 R14: 0000000000000003 R15: 00007fffad85bd80 INFO: task syz-executor:6343 is blocked on an rw-semaphore, but the owner is not found. INFO: task syz-executor:6350 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-executor state:D stack:21240 pid:6350 tgid:6350 ppid:1 task_flags:0x40054c flags:0x00004004 Call Trace: context_switch kernel/sched/core.c:5357 [inline] __schedule+0x1794/0x4c40 kernel/sched/core.c:6961 __schedule_loop kernel/sched/core.c:7043 [inline] schedule+0x161/0x360 kernel/sched/core.c:7058 schedule_preempt_disabled+0xf/0x20 kernel/sched/core.c:7115 rwsem_down_write_slowpath+0x922/0x10d0 kernel/locking/rwsem.c:1185 __down_write_common kernel/locking/rwsem.c:1317 [inline] __down_write kernel/locking/rwsem.c:1326 [inline] down_write+0x1a7/0x1f0 kernel/locking/rwsem.c:1591 mmap_write_lock include/linux/mmap_lock.h:397 [inline] exit_mmap+0x28a/0xb10 mm/mmap.c:1288 __mmput+0x118/0x430 kernel/fork.c:1129 exit_mm+0x1d6/0x2b0 kernel/exit.c:582 do_exit+0x644/0x22f0 kernel/exit.c:949 do_group_exit+0x218/0x2d0 kernel/exit.c:1102 get_signal+0x125a/0x1310 kernel/signal.c:3034 arch_do_signal_or_restart+0x96/0x750 arch/x86/kernel/signal.c:337 exit_to_user_mode_loop+0x71/0x110 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+0x213/0x2e0 arch/x86/entry/syscall_64.c:100 entry_SYSCALL_64_after_hwframe+0x76/0x7e RIP: 0033:0x7f0e4af85613 RSP: 002b:00007fff21fb0178 EFLAGS: 00000246 ORIG_RAX: 0000000000000038 RAX: fffffffffffffff4 RBX: 0000000000000000 RCX: 00007f0e4af85613 RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000001200011 RBP: 0000000000000001 R08: 0000000000000000 R09: 0000000000000001 R10: 000055556fe367d0 R11: 0000000000000246 R12: 0000000000000000 R13: 00007f0e4b1b1280 R14: 0000000000000003 R15: 00007fff21fb0310 INFO: task syz-executor:6350 is blocked on an rw-semaphore, but the owner is not found. INFO: task syz-executor:6351 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-executor state:D stack:21656 pid:6351 tgid:6351 ppid:1 task_flags:0x40054c flags:0x00004004 Call Trace: context_switch kernel/sched/core.c:5357 [inline] __schedule+0x1794/0x4c40 kernel/sched/core.c:6961 __schedule_loop kernel/sched/core.c:7043 [inline] schedule+0x161/0x360 kernel/sched/core.c:7058 schedule_preempt_disabled+0xf/0x20 kernel/sched/core.c:7115 rwsem_down_write_slowpath+0x922/0x10d0 kernel/locking/rwsem.c:1185 __down_write_common kernel/locking/rwsem.c:1317 [inline] __down_write kernel/locking/rwsem.c:1326 [inline] down_write+0x1a7/0x1f0 kernel/locking/rwsem.c:1591 mmap_write_lock include/linux/mmap_lock.h:397 [inline] exit_mmap+0x28a/0xb10 mm/mmap.c:1288 __mmput+0x118/0x430 kernel/fork.c:1129 exit_mm+0x1d6/0x2b0 kernel/exit.c:582 do_exit+0x644/0x22f0 kernel/exit.c:949 do_group_exit+0x218/0x2d0 kernel/exit.c:1102 get_signal+0x125a/0x1310 kernel/signal.c:3034 arch_do_signal_or_restart+0x96/0x750 arch/x86/kernel/signal.c:337 exit_to_user_mode_loop+0x71/0x110 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+0x213/0x2e0 arch/x86/entry/syscall_64.c:100 entry_SYSCALL_64_after_hwframe+0x76/0x7e RIP: 0033:0x7fc386585613 RSP: 002b:00007ffe3bd92a78 EFLAGS: 00000246 ORIG_RAX: 0000000000000038 RAX: fffffffffffffff4 RBX: 0000000000000000 RCX: 00007fc386585613 RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000001200011 RBP: 0000000000000001 R08: 0000000000000000 R09: 0000000000000001 R10: 000055557a2317d0 R11: 0000000000000246 R12: 0000000000000000 R13: 00000000000927c0 R14: 0000000000026338 R15: 00007ffe3bd92c10 INFO: task syz-executor:6351 is blocked on an rw-semaphore, but the owner is not found. INFO: task syz.4.34:6653 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.4.34 state:D stack:26840 pid:6653 tgid:6653 ppid:6354 task_flags:0x40004c flags:0x00004000 Call Trace: context_switch kernel/sched/core.c:5357 [inline] __schedule+0x1794/0x4c40 kernel/sched/core.c:6961 __schedule_loop kernel/sched/core.c:7043 [inline] schedule+0x161/0x360 kernel/sched/core.c:7058 schedule_preempt_disabled+0xf/0x20 kernel/sched/core.c:7115 rwsem_down_write_slowpath+0x922/0x10d0 kernel/locking/rwsem.c:1185 __down_write_common kernel/locking/rwsem.c:1317 [inline] __down_write kernel/locking/rwsem.c:1326 [inline] down_write+0x1a7/0x1f0 kernel/locking/rwsem.c:1591 mmap_write_lock include/linux/mmap_lock.h:397 [inline] exit_mmap+0x28a/0xb10 mm/mmap.c:1288 __mmput+0x118/0x430 kernel/fork.c:1129 exit_mm+0x1d6/0x2b0 kernel/exit.c:582 do_exit+0x644/0x22f0 kernel/exit.c:949 do_group_exit+0x218/0x2d0 kernel/exit.c:1102 __do_sys_exit_group kernel/exit.c:1113 [inline] __se_sys_exit_group kernel/exit.c:1111 [inline] __x64_sys_exit_group+0x3b/0x40 kernel/exit.c:1111 x64_sys_call+0x21f3/0x2200 arch/x86/include/generated/asm/syscalls_64.h:232 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0x86/0x2e0 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x76/0x7e RIP: 0033:0x7f4263b8eec9 RSP: 002b:00007fffd40f29d8 EFLAGS: 00000246 ORIG_RAX: 00000000000000e7 RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 00007f4263b8eec9 RDX: 0000000000000064 RSI: 0000000000000000 RDI: 0000000000000000 RBP: 00007fffd40f2a3c R08: 00000005d40f2acf R09: 00000000000927c0 R10: 0000000000000001 R11: 0000000000000246 R12: 000000000000000d R13: 00000000000927c0 R14: 0000000000026275 R15: 00007fffd40f2a90 INFO: task syz.4.34:6653 is blocked on an rw-semaphore, but the owner is not found. Showing all locks held in the system: 1 lock held by khungtaskd/31: #0: ffffffff8db39620 (rcu_read_lock){....}-{1:3}, at: rcu_lock_acquire include/linux/rcupdate.h:331 [inline] #0: ffffffff8db39620 (rcu_read_lock){....}-{1:3}, at: rcu_read_lock include/linux/rcupdate.h:841 [inline] #0: ffffffff8db39620 (rcu_read_lock){....}-{1:3}, at: debug_show_all_locks+0x2a/0x180 kernel/locking/lockdep.c:6775 2 locks held by kworker/u8:3/42: #0: ffff8880b8939f98 (&rq->__lock){-.-.}-{2:2}, at: raw_spin_rq_lock_nested+0x26/0x140 kernel/sched/core.c:636 #1: ffff8880b8924008 (psi_seq){-.-.}-{0:0}, at: psi_sched_switch kernel/sched/stats.h:220 [inline] #1: ffff8880b8924008 (psi_seq){-.-.}-{0:0}, at: __schedule+0x22ae/0x4c40 kernel/sched/core.c:6955 2 locks held by getty/5557: #0: ffff88814dff00a0 (&tty->ldisc_sem){++++}-{0:0}, at: tty_ldisc_ref_wait+0x21/0x70 drivers/tty/tty_ldisc.c:243 #1: ffffc9000332b2f0 (&ldata->atomic_read_lock){+.+.}-{4:4}, at: n_tty_read+0x43a/0x1400 drivers/tty/n_tty.c:2222 1 lock held by syz-executor/6211: #0: ffff88807baaed60 (&mm->mmap_lock){++++}-{4:4}, at: mmap_write_lock_killable include/linux/mmap_lock.h:415 [inline] #0: ffff88807baaed60 (&mm->mmap_lock){++++}-{4:4}, at: vm_mmap_pgoff+0x20d/0x4c0 mm/util.c:578 1 lock held by syz-executor/6343: #0: ffff888023461760 (&mm->mmap_lock){++++}-{4:4}, at: mmap_write_lock include/linux/mmap_lock.h:397 [inline] #0: ffff888023461760 (&mm->mmap_lock){++++}-{4:4}, at: exit_mmap+0x28a/0xb10 mm/mmap.c:1288 1 lock held by syz-executor/6350: #0: ffff88805a1581e0 (&mm->mmap_lock){++++}-{4:4}, at: mmap_write_lock include/linux/mmap_lock.h:397 [inline] #0: ffff88805a1581e0 (&mm->mmap_lock){++++}-{4:4}, at: exit_mmap+0x28a/0xb10 mm/mmap.c:1288 1 lock held by syz-executor/6351: #0: ffff88807bf08ca0 (&mm->mmap_lock){++++}-{4:4}, at: mmap_write_lock include/linux/mmap_lock.h:397 [inline] #0: ffff88807bf08ca0 (&mm->mmap_lock){++++}-{4:4}, at: exit_mmap+0x28a/0xb10 mm/mmap.c:1288 1 lock held by syz-executor/6353: #0: ffff88807bf081e0 (&mm->mmap_lock){++++}-{4:4}, at: mmap_write_lock include/linux/mmap_lock.h:397 [inline] #0: ffff88807bf081e0 (&mm->mmap_lock){++++}-{4:4}, at: exit_mmap+0x28a/0xb10 mm/mmap.c:1288 1 lock held by syz-executor/6354: #0: ffff88805a159760 (&mm->mmap_lock){++++}-{4:4}, at: mmap_write_lock include/linux/mmap_lock.h:397 [inline] #0: ffff88805a159760 (&mm->mmap_lock){++++}-{4:4}, at: exit_mmap+0x28a/0xb10 mm/mmap.c:1288 1 lock held by syz.4.34/6653: #0: ffff88807688cd20 (&mm->mmap_lock){++++}-{4:4}, at: mmap_write_lock include/linux/mmap_lock.h:397 [inline] #0: ffff88807688cd20 (&mm->mmap_lock){++++}-{4:4}, at: exit_mmap+0x28a/0xb10 mm/mmap.c:1288 1 lock held by cmp/6654: #0: ffff888076889760 (&mm->mmap_lock){++++}-{4:4}, at: mmap_write_lock_killable include/linux/mmap_lock.h:415 [inline] #0: ffff888076889760 (&mm->mmap_lock){++++}-{4:4}, at: vm_mmap_pgoff+0x20d/0x4c0 mm/util.c:578 1 lock held by syz-executor/6661: #0: ffff88807baa81e0 (&mm->mmap_lock){++++}-{4:4}, at: mmap_write_lock include/linux/mmap_lock.h:397 [inline] #0: ffff88807baa81e0 (&mm->mmap_lock){++++}-{4:4}, at: exit_mmap+0x28a/0xb10 mm/mmap.c:1288 2 locks held by syz-executor/6665: #0: ffffffff8dbf0890 (dup_mmap_sem){.+.+}-{0:0}, at: dup_mm kernel/fork.c:1484 [inline] #0: ffffffff8dbf0890 (dup_mmap_sem){.+.+}-{0:0}, at: copy_mm+0x131/0x4b0 kernel/fork.c:1537 #1: ffff88807c952220 (&mm->mmap_lock){++++}-{4:4}, at: mmap_write_lock_killable include/linux/mmap_lock.h:415 [inline] #1: ffff88807c952220 (&mm->mmap_lock){++++}-{4:4}, at: dup_mmap+0x12a/0x1a90 mm/mmap.c:1727 2 locks held by syz-executor/6669: #0: ffffffff8dbf0890 (dup_mmap_sem){.+.+}-{0:0}, at: dup_mm kernel/fork.c:1484 [inline] #0: ffffffff8dbf0890 (dup_mmap_sem){.+.+}-{0:0}, at: copy_mm+0x131/0x4b0 kernel/fork.c:1537 #1: ffff88807c956d60 (&mm->mmap_lock){++++}-{4:4}, at: mmap_write_lock_killable include/linux/mmap_lock.h:415 [inline] #1: ffff88807c956d60 (&mm->mmap_lock){++++}-{4:4}, at: dup_mmap+0x12a/0x1a90 mm/mmap.c:1727 1 lock held by syz.5.56/6824: #0: ffff888028dbb7a0 (&mm->mmap_lock){++++}-{4:4}, at: mmap_write_lock include/linux/mmap_lock.h:397 [inline] #0: ffff888028dbb7a0 (&mm->mmap_lock){++++}-{4:4}, at: exit_mmap+0x28a/0xb10 mm/mmap.c:1288 1 lock held by syz.9.57/6827: #0: ffff88802e01b7a0 (&mm->mmap_lock){++++}-{4:4}, at: mmap_write_lock include/linux/mmap_lock.h:397 [inline] #0: ffff88802e01b7a0 (&mm->mmap_lock){++++}-{4:4}, at: exit_mmap+0x28a/0xb10 mm/mmap.c:1288 1 lock held by syz.8.60/6838: #0: ffff88806207ed60 (&mm->mmap_lock){++++}-{4:4}, at: mmap_write_lock include/linux/mmap_lock.h:397 [inline] #0: ffff88806207ed60 (&mm->mmap_lock){++++}-{4:4}, at: exit_mmap+0x28a/0xb10 mm/mmap.c:1288 ============================================= NMI backtrace for cpu 1 CPU: 1 UID: 0 PID: 31 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+0x185/0x250 lib/dump_stack.c:120 nmi_cpu_backtrace+0x39a/0x3d0 lib/nmi_backtrace.c:113 nmi_trigger_cpumask_backtrace+0x176/0x2e0 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+0x15a7/0x15f0 kernel/hung_task.c:491 kthread+0x70a/0x890 kernel/kthread.c:463 ret_from_fork+0x431/0x7a0 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:on_stack arch/x86/include/asm/stacktrace.h:55 [inline] RIP: 0010:stack_access_ok arch/x86/kernel/unwind_orc.c:393 [inline] RIP: 0010:deref_stack_reg arch/x86/kernel/unwind_orc.c:403 [inline] RIP: 0010:unwind_next_frame+0xad2/0x2390 arch/x86/kernel/unwind_orc.c:585 Code: 00 00 83 fe 02 0f 85 a1 07 00 00 4c 89 7c 24 28 4d 8d 7e 08 4c 89 fd 48 c1 ed 03 48 b8 00 00 00 00 00 fc ff df 80 7c 05 00 00 <74> 08 4c 89 ff e8 14 55 af 00 4c 89 7c 24 60 48 89 5c 24 78 4d 8b RSP: 0018:ffffc90000007358 EFLAGS: 00000246 RAX: dffffc0000000000 RBX: ffffffff904ed513 RCX: ffffffff8fa750b0 RDX: ffffffff904ed50e RSI: 0000000000000002 RDI: ffffffff8b7e7420 RBP: 1ffff92000000e86 R08: 0000000000000001 R09: ffffffff817195d1 R10: ffffc90000007478 R11: ffffffff81aaa3c0 R12: ffffc900000078e0 R13: ffffc90000007478 R14: ffffc90000007428 R15: ffffc90000007430 FS: 0000000000000000(0000) GS:ffff88812669e000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007fdce0cd5e80 CR3: 0000000079f94000 CR4: 00000000003526f0 Call Trace: arch_stack_walk+0x118/0x150 arch/x86/kernel/stacktrace.c:25 stack_trace_save+0x98/0xe0 kernel/stacktrace.c:122 ref_tracker_alloc+0x179/0x460 lib/ref_tracker.c:277 __netdev_tracker_alloc include/linux/netdevice.h:4349 [inline] netdev_hold include/linux/netdevice.h:4378 [inline] ___neigh_create+0xc9e/0x2260 net/core/neighbour.c:665 ip6_finish_output2+0xb49/0x1690 net/ipv6/ip6_output.c:132 dst_output include/net/dst.h:461 [inline] NF_HOOK include/linux/netfilter.h:318 [inline] ndisc_send_skb+0xbb8/0x1520 net/ipv6/ndisc.c:512 addrconf_rs_timer+0x365/0x660 net/ipv6/addrconf.c:4037 call_timer_fn+0x17a/0x5d0 kernel/time/timer.c:1747 expire_timers kernel/time/timer.c:1798 [inline] __run_timers kernel/time/timer.c:2372 [inline] __run_timer_base+0x616/0x860 kernel/time/timer.c:2384 run_timer_base kernel/time/timer.c:2393 [inline] run_timer_softirq+0xb3/0x170 kernel/time/timer.c:2403 handle_softirqs+0x27f/0x850 kernel/softirq.c:579 __do_softirq kernel/softirq.c:613 [inline] invoke_softirq kernel/softirq.c:453 [inline] __irq_exit_rcu+0xc6/0x1e0 kernel/softirq.c:680 irq_exit_rcu+0x5/0x20 kernel/softirq.c:696 instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1050 [inline] sysvec_apic_timer_interrupt+0xa0/0xc0 arch/x86/kernel/apic/apic.c:1050 asm_sysvec_apic_timer_interrupt+0x16/0x20 arch/x86/include/asm/idtentry.h:702 RIP: 0010:pv_native_safe_halt+0xb/0x20 arch/x86/kernel/paravirt.c:82 Code: 18 43 02 e9 47 e7 02 00 cc cc cc cc cc cc cc 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 66 90 0f 00 2d 47 2f 1b 00 fb f4 cc cc cc cc cc cc cc cc cc cc cc cc cc cc cc cc cc cc cc cc 90 RSP: 0018:ffffffff8d807d80 EFLAGS: 000002c6 RAX: e3a8f7118a4ed100 RBX: ffffffff819506f4 RCX: e3a8f7118a4ed100 RDX: 0000000000000001 RSI: ffffffff8d2e0613 RDI: ffffffff8b7e7480 RBP: ffffffff8d807eb8 R08: ffff8880b8832f9b R09: 1ffff110171065f3 R10: dffffc0000000000 R11: ffffed10171065f4 R12: ffffffff8f35e370 R13: 0000000000000000 R14: 0000000000000000 R15: 1ffffffff1b128f0 arch_safe_halt arch/x86/include/asm/paravirt.h:107 [inline] default_idle+0xf/0x20 arch/x86/kernel/process.c:757 default_idle_call+0x6e/0xb0 kernel/sched/idle.c:122 cpuidle_idle_call kernel/sched/idle.c:190 [inline] do_idle+0x1e4/0x510 kernel/sched/idle.c:330 cpu_startup_entry+0x40/0x60 kernel/sched/idle.c:428 rest_init+0x2de/0x300 init/main.c:744 start_kernel+0x3a5/0x400 init/main.c:1097 x86_64_start_reservations+0x20/0x20 arch/x86/kernel/head64.c:307 x86_64_start_kernel+0x13f/0x1c0 arch/x86/kernel/head64.c:288 common_startup_64+0x13e/0x147