INFO: task syz.3.276:5057 blocked for more than 143 seconds. Not tainted 5.15.182-syzkaller #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. task:syz.3.276 state:D stack:24224 pid: 5057 ppid: 4180 flags:0x00004006 Call Trace: context_switch kernel/sched/core.c:5030 [inline] __schedule+0x11b8/0x43b0 kernel/sched/core.c:6376 schedule+0x11b/0x1e0 kernel/sched/core.c:6459 perf_pending_task_sync+0x13c/0x1c0 kernel/events/core.c:5127 _free_event+0x34/0xe60 kernel/events/core.c:5133 put_event kernel/events/core.c:5258 [inline] perf_event_release_kernel+0x832/0x8c0 kernel/events/core.c:5383 perf_release+0x37/0x40 kernel/events/core.c:5393 __fput+0x234/0x930 fs/file_table.c:311 task_work_run+0x125/0x1a0 kernel/task_work.c:188 exit_task_work include/linux/task_work.h:33 [inline] do_exit+0x616/0x20a0 kernel/exit.c:874 do_group_exit+0x12e/0x300 kernel/exit.c:996 get_signal+0x6ca/0x12c0 kernel/signal.c:2900 arch_do_signal_or_restart+0xc1/0x1300 arch/x86/kernel/signal.c:867 handle_signal_work kernel/entry/common.c:154 [inline] exit_to_user_mode_loop+0x9e/0x130 kernel/entry/common.c:178 exit_to_user_mode_prepare+0xb1/0x140 kernel/entry/common.c:214 __syscall_exit_to_user_mode_work kernel/entry/common.c:296 [inline] syscall_exit_to_user_mode+0x16/0x40 kernel/entry/common.c:307 do_syscall_64+0x58/0xa0 arch/x86/entry/common.c:86 entry_SYSCALL_64_after_hwframe+0x66/0xd0 RIP: 0033:0x7fd4cac1e969 RSP: 002b:00007fd4c8a86038 EFLAGS: 00000246 ORIG_RAX: 0000000000000001 RAX: 0000000000000012 RBX: 00007fd4cae45fa0 RCX: 00007fd4cac1e969 RDX: 0000000000000012 RSI: 0000200000000040 RDI: 0000000000000005 RBP: 00007fd4caca0ab1 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 0000000000000000 R14: 00007fd4cae45fa0 R15: 00007ffe79a9b278 Showing all locks held in the system: 1 lock held by khungtaskd/27: #0: ffffffff8c11bea0 (rcu_read_lock){....}-{1:2}, at: rcu_lock_acquire+0x0/0x30 3 locks held by kworker/u4:2/154: 2 locks held by getty/3933: #0: ffff88814c8f6098 (&tty->ldisc_sem){++++}-{0:0}, at: tty_ldisc_ref_wait+0x21/0x70 drivers/tty/tty_ldisc.c:252 #1: ffffc900026362e8 (&ldata->atomic_read_lock){+.+.}-{3:3}, at: n_tty_read+0x5ba/0x1a30 drivers/tty/n_tty.c:2158 3 locks held by syz.1.1830/9474: ============================================= NMI backtrace for cpu 1 CPU: 1 PID: 27 Comm: khungtaskd Not tainted 5.15.182-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 04/19/2025 Call Trace: dump_stack_lvl+0x168/0x230 lib/dump_stack.c:106 nmi_cpu_backtrace+0x397/0x3d0 lib/nmi_backtrace.c:111 nmi_trigger_cpumask_backtrace+0x163/0x280 lib/nmi_backtrace.c:62 trigger_all_cpu_backtrace include/linux/nmi.h:148 [inline] check_hung_uninterruptible_tasks kernel/hung_task.c:212 [inline] watchdog+0xe0f/0xe50 kernel/hung_task.c:369 kthread+0x436/0x520 kernel/kthread.c:334 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:287 Sending NMI from CPU 1 to CPUs 0: NMI backtrace for cpu 0 CPU: 0 PID: 9474 Comm: syz.1.1830 Not tainted 5.15.182-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 04/19/2025 RIP: 0010:__lock_acquire+0xfde/0x7c60 kernel/locking/lockdep.c:-1 Code: 40 80 e1 07 80 c1 03 38 c1 7c c7 48 8b 7c 24 40 e8 b7 3a 61 00 eb bb 44 89 e0 25 ff 1f 00 00 41 c1 ec 03 41 81 e4 00 60 00 00 <41> 09 c4 4c 89 fe 48 c1 ee 20 89 f0 c1 c0 04 41 29 f4 44 31 e0 44 RSP: 0018:ffffc900000071c0 EFLAGS: 00000006 RAX: 0000000000000015 RBX: 0000000000000000 RCX: ffff88801d64a8b0 RDX: 0000000000000000 RSI: 0000000000000008 RDI: ffffffff8ff9a0c0 RBP: ffffc90000007410 R08: dffffc0000000000 R09: fffffbfff1ff3419 R10: fffffbfff1ff3419 R11: 1ffffffff1ff3418 R12: 0000000000004000 R13: ffff88801d649dc0 R14: 1ffff11003ac9514 R15: 9be2421a50ef4013 FS: 0000000000000000(0000) GS:ffff8880b9000000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007fbb3fe932d8 CR3: 0000000063d65000 CR4: 00000000003506f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000600 Call Trace: lock_acquire+0x197/0x3f0 kernel/locking/lockdep.c:5623 rcu_lock_acquire+0x2a/0x30 include/linux/rcupdate.h:312 rcu_read_lock include/linux/rcupdate.h:739 [inline] is_bpf_text_address+0x1d/0x270 kernel/bpf/core.c:725 kernel_text_address kernel/extable.c:151 [inline] __kernel_text_address+0x9a/0x100 kernel/extable.c:105 unwind_get_return_address+0x49/0x80 arch/x86/kernel/unwind_orc.c:323 perf_callchain_kernel+0x3f6/0x650 arch/x86/events/core.c:2784 get_perf_callchain+0x376/0x480 kernel/events/callchain.c:200 perf_callchain kernel/events/core.c:7582 [inline] perf_prepare_sample+0x324/0x1c40 kernel/events/core.c:7609 __perf_event_output kernel/events/core.c:7778 [inline] perf_event_output_forward+0x146/0x280 kernel/events/core.c:7798 __perf_event_overflow+0x364/0x530 kernel/events/core.c:9491 perf_swevent_hrtimer+0x3db/0x530 kernel/events/core.c:10887 __run_hrtimer kernel/time/hrtimer.c:1690 [inline] __hrtimer_run_queues+0x4fe/0xc40 kernel/time/hrtimer.c:1754 hrtimer_interrupt+0x3bb/0x8d0 kernel/time/hrtimer.c:1816 local_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1097 [inline] __sysvec_apic_timer_interrupt+0x137/0x4a0 arch/x86/kernel/apic/apic.c:1114 instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1108 [inline] sysvec_apic_timer_interrupt+0x9b/0xc0 arch/x86/kernel/apic/apic.c:1108 asm_sysvec_apic_timer_interrupt+0x16/0x20 arch/x86/include/asm/idtentry.h:676 RIP: 0010:_compound_head include/linux/page-flags.h:196 [inline] RIP: 0010:PageAnon include/linux/page-flags.h:503 [inline] RIP: 0010:zap_pte_range mm/memory.c:1374 [inline] RIP: 0010:zap_pmd_range mm/memory.c:1505 [inline] RIP: 0010:zap_pud_range mm/memory.c:1534 [inline] RIP: 0010:zap_p4d_range mm/memory.c:1555 [inline] RIP: 0010:unmap_page_range+0xcc9/0x2520 mm/memory.c:1576 Code: 4c 24 40 4c 89 21 42 0f b6 04 33 84 c0 0f 85 10 0e 00 00 41 80 4d 00 08 4d 85 ff 4c 8b 34 24 48 8b 5c 24 10 0f 84 8f 0c 00 00 <4d> 8d 6f 08 4c 89 e9 48 c1 e9 03 48 b8 00 00 00 00 00 fc ff df 48 RSP: 0018:ffffc9000327f560 EFLAGS: 00000286 RAX: 0000000000000000 RBX: ffff88805c9b1648 RCX: ffffc9000327f838 RDX: 0000000000000000 RSI: 0000000000000001 RDI: 0000000000000000 RBP: ffffc9000327f6d0 R08: dffffc0000000000 R09: ffffed1003ac93b9 R10: ffffed1003ac93b9 R11: 1ffff11003ac93b8 R12: ffffffffffffffff R13: ffffc9000327f840 R14: 00007f460b8ca000 R15: ffffea0001c85600 unmap_vmas+0x11b/0x230 mm/memory.c:1653 exit_mmap+0x38f/0x5f0 mm/mmap.c:3204 __mmput+0x115/0x3b0 kernel/fork.c:1127 exit_mm+0x567/0x6c0 kernel/exit.c:550 do_exit+0x599/0x20a0 kernel/exit.c:861 do_group_exit+0x12e/0x300 kernel/exit.c:996 get_signal+0x6ca/0x12c0 kernel/signal.c:2900 arch_do_signal_or_restart+0xc1/0x1300 arch/x86/kernel/signal.c:867 handle_signal_work kernel/entry/common.c:154 [inline] exit_to_user_mode_loop+0x9e/0x130 kernel/entry/common.c:178 exit_to_user_mode_prepare+0xb1/0x140 kernel/entry/common.c:214 __syscall_exit_to_user_mode_work kernel/entry/common.c:296 [inline] syscall_exit_to_user_mode+0x16/0x40 kernel/entry/common.c:307 do_syscall_64+0x58/0xa0 arch/x86/entry/common.c:86 entry_SYSCALL_64_after_hwframe+0x66/0xd0 RIP: 0033:0x7f460b804969 Code: Unable to access opcode bytes at RIP 0x7f460b80493f. RSP: 002b:00007f460966c038 EFLAGS: 00000246 ORIG_RAX: 0000000000000010 RAX: 0000000000000000 RBX: 00007f460ba2bfa0 RCX: 00007f460b804969 RDX: 0000200000000080 RSI: 00000000400454ca RDI: 0000000000000004 RBP: 00007f460b886ab1 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 0000000000000000 R14: 00007f460ba2bfa0 R15: 00007ffed1dddd18