INFO: task syz-executor.4:674 blocked for more than 143 seconds. Not tainted 5.16.0-syzkaller #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. task:syz-executor.4 state:D stack:27992 pid: 674 ppid: 3658 flags:0x20004000 Call Trace: context_switch kernel/sched/core.c:4986 [inline] __schedule+0xab2/0x4f00 kernel/sched/core.c:6296 schedule+0xd2/0x260 kernel/sched/core.c:6369 rwsem_down_read_slowpath+0x589/0xa70 kernel/locking/rwsem.c:1032 __down_read_common kernel/locking/rwsem.c:1214 [inline] __down_read kernel/locking/rwsem.c:1223 [inline] down_read+0xe2/0x440 kernel/locking/rwsem.c:1463 mmap_read_lock include/linux/mmap_lock.h:117 [inline] exit_mm kernel/exit.c:483 [inline] do_exit+0xa0a/0x2b40 kernel/exit.c:819 do_group_exit+0x125/0x310 kernel/exit.c:929 __do_sys_exit_group kernel/exit.c:940 [inline] __se_sys_exit_group kernel/exit.c:938 [inline] __ia32_sys_exit_group+0x3a/0x50 kernel/exit.c:938 do_syscall_32_irqs_on arch/x86/entry/common.c:112 [inline] __do_fast_syscall_32+0x65/0xf0 arch/x86/entry/common.c:178 do_fast_syscall_32+0x2f/0x70 arch/x86/entry/common.c:203 entry_SYSENTER_compat_after_hwframe+0x4d/0x5c RIP: 0023:0xf6ee9549 RSP: 002b:00000000f757ad1c EFLAGS: 00000286 ORIG_RAX: 00000000000000fc RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 0000000000000000 RDX: 00000000ffffffff RSI: 00000000f7021000 RDI: 00000000f7021000 RBP: 000000000000001e R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000000 R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000 INFO: task syz-executor.4:675 blocked for more than 143 seconds. Not tainted 5.16.0-syzkaller #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. task:syz-executor.4 state:D stack:27920 pid: 675 ppid: 3658 flags:0x20004000 Call Trace: context_switch kernel/sched/core.c:4986 [inline] __schedule+0xab2/0x4f00 kernel/sched/core.c:6296 schedule+0xd2/0x260 kernel/sched/core.c:6369 rwsem_down_read_slowpath+0x589/0xa70 kernel/locking/rwsem.c:1032 __down_read_common kernel/locking/rwsem.c:1214 [inline] __down_read kernel/locking/rwsem.c:1223 [inline] down_read+0xe2/0x440 kernel/locking/rwsem.c:1463 mmap_read_lock include/linux/mmap_lock.h:117 [inline] exit_mm kernel/exit.c:483 [inline] do_exit+0xa0a/0x2b40 kernel/exit.c:819 do_group_exit+0x125/0x310 kernel/exit.c:929 get_signal+0x47d/0x2220 kernel/signal.c:2852 arch_do_signal_or_restart+0x2a9/0x1c40 arch/x86/kernel/signal.c:868 handle_signal_work kernel/entry/common.c:148 [inline] exit_to_user_mode_loop kernel/entry/common.c:172 [inline] exit_to_user_mode_prepare+0x17d/0x290 kernel/entry/common.c:207 __syscall_exit_to_user_mode_work kernel/entry/common.c:289 [inline] syscall_exit_to_user_mode+0x19/0x60 kernel/entry/common.c:300 __do_fast_syscall_32+0x72/0xf0 arch/x86/entry/common.c:181 do_fast_syscall_32+0x2f/0x70 arch/x86/entry/common.c:203 entry_SYSENTER_compat_after_hwframe+0x4d/0x5c RIP: 0023:0xf6ee9549 RSP: 002b:00000000f58e35cc EFLAGS: 00000296 ORIG_RAX: 00000000000000c0 RAX: fffffffffffffffc RBX: 0000000020341000 RCX: 0000000000002000 RDX: 0000000000000000 RSI: 0000000000000011 RDI: 0000000000000004 RBP: 0000000000000000 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000000 R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000 INFO: task syz-executor.4:678 blocked for more than 144 seconds. Not tainted 5.16.0-syzkaller #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. task:syz-executor.4 state:D stack:29528 pid: 678 ppid: 3658 flags:0x20004000 Call Trace: context_switch kernel/sched/core.c:4986 [inline] __schedule+0xab2/0x4f00 kernel/sched/core.c:6296 schedule+0xd2/0x260 kernel/sched/core.c:6369 rwsem_down_read_slowpath+0x589/0xa70 kernel/locking/rwsem.c:1032 __down_read_common kernel/locking/rwsem.c:1214 [inline] __down_read kernel/locking/rwsem.c:1223 [inline] down_read+0xe2/0x440 kernel/locking/rwsem.c:1463 mmap_read_lock include/linux/mmap_lock.h:117 [inline] exit_mm kernel/exit.c:483 [inline] do_exit+0xa0a/0x2b40 kernel/exit.c:819 do_group_exit+0x125/0x310 kernel/exit.c:929 get_signal+0x47d/0x2220 kernel/signal.c:2852 arch_do_signal_or_restart+0x2a9/0x1c40 arch/x86/kernel/signal.c:868 handle_signal_work kernel/entry/common.c:148 [inline] exit_to_user_mode_loop kernel/entry/common.c:172 [inline] exit_to_user_mode_prepare+0x17d/0x290 kernel/entry/common.c:207 __syscall_exit_to_user_mode_work kernel/entry/common.c:289 [inline] syscall_exit_to_user_mode+0x19/0x60 kernel/entry/common.c:300 __do_fast_syscall_32+0x72/0xf0 arch/x86/entry/common.c:181 do_fast_syscall_32+0x2f/0x70 arch/x86/entry/common.c:203 entry_SYSENTER_compat_after_hwframe+0x4d/0x5c RIP: 0023:0xf6ee9549 RSP: 002b:00000000f58a167c EFLAGS: 00000296 ORIG_RAX: 00000000000000f0 RAX: fffffffffffffe00 RBX: 00000000f70460b8 RCX: 0000000000000080 RDX: 0000000000000000 RSI: 0000000000000000 RDI: 00000000f70460bc RBP: 0000000000000081 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000000 R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000 INFO: task syz-executor.4:679 blocked for more than 144 seconds. Not tainted 5.16.0-syzkaller #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. task:syz-executor.4 state:D stack:28400 pid: 679 ppid: 3658 flags:0x20004000 Call Trace: context_switch kernel/sched/core.c:4986 [inline] __schedule+0xab2/0x4f00 kernel/sched/core.c:6296 schedule+0xd2/0x260 kernel/sched/core.c:6369 rwsem_down_read_slowpath+0x589/0xa70 kernel/locking/rwsem.c:1032 __down_read_common kernel/locking/rwsem.c:1214 [inline] __down_read kernel/locking/rwsem.c:1223 [inline] down_read+0xe2/0x440 kernel/locking/rwsem.c:1463 mmap_read_lock include/linux/mmap_lock.h:117 [inline] exit_mm kernel/exit.c:483 [inline] do_exit+0xa0a/0x2b40 kernel/exit.c:819 do_group_exit+0x125/0x310 kernel/exit.c:929 get_signal+0x47d/0x2220 kernel/signal.c:2852 arch_do_signal_or_restart+0x2a9/0x1c40 arch/x86/kernel/signal.c:868 handle_signal_work kernel/entry/common.c:148 [inline] exit_to_user_mode_loop kernel/entry/common.c:172 [inline] exit_to_user_mode_prepare+0x17d/0x290 kernel/entry/common.c:207 __syscall_exit_to_user_mode_work kernel/entry/common.c:289 [inline] syscall_exit_to_user_mode+0x19/0x60 kernel/entry/common.c:300 __do_fast_syscall_32+0x72/0xf0 arch/x86/entry/common.c:181 do_fast_syscall_32+0x2f/0x70 arch/x86/entry/common.c:203 entry_SYSENTER_compat_after_hwframe+0x4d/0x5c RIP: 0023:0xf6ee9549 RSP: 002b:00000000f588067c EFLAGS: 00000296 ORIG_RAX: 00000000000000f0 RAX: fffffffffffffe00 RBX: 00000000f7046140 RCX: 0000000000000080 RDX: 0000000000000000 RSI: 0000000000000000 RDI: 00000000f7046144 RBP: 0000000000000081 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000000 R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000 INFO: task syz-executor.4:680 blocked for more than 144 seconds. Not tainted 5.16.0-syzkaller #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. task:syz-executor.4 state:D stack:29112 pid: 680 ppid: 3658 flags:0x20004000 Call Trace: context_switch kernel/sched/core.c:4986 [inline] __schedule+0xab2/0x4f00 kernel/sched/core.c:6296 schedule+0xd2/0x260 kernel/sched/core.c:6369 rwsem_down_read_slowpath+0x589/0xa70 kernel/locking/rwsem.c:1032 __down_read_common kernel/locking/rwsem.c:1214 [inline] __down_read kernel/locking/rwsem.c:1223 [inline] down_read+0xe2/0x440 kernel/locking/rwsem.c:1463 mmap_read_lock include/linux/mmap_lock.h:117 [inline] exit_mm kernel/exit.c:483 [inline] do_exit+0xa0a/0x2b40 kernel/exit.c:819 do_group_exit+0x125/0x310 kernel/exit.c:929 get_signal+0x47d/0x2220 kernel/signal.c:2852 arch_do_signal_or_restart+0x2a9/0x1c40 arch/x86/kernel/signal.c:868 handle_signal_work kernel/entry/common.c:148 [inline] exit_to_user_mode_loop kernel/entry/common.c:172 [inline] exit_to_user_mode_prepare+0x17d/0x290 kernel/entry/common.c:207 __syscall_exit_to_user_mode_work kernel/entry/common.c:289 [inline] syscall_exit_to_user_mode+0x19/0x60 kernel/entry/common.c:300 __do_fast_syscall_32+0x72/0xf0 arch/x86/entry/common.c:181 do_fast_syscall_32+0x2f/0x70 arch/x86/entry/common.c:203 entry_SYSENTER_compat_after_hwframe+0x4d/0x5c RIP: 0023:0xf6ee9549 RSP: 002b:00000000f585f67c EFLAGS: 00000296 ORIG_RAX: 00000000000000f0 RAX: fffffffffffffe00 RBX: 00000000f70461c8 RCX: 0000000000000080 RDX: 0000000000000000 RSI: 0000000000000000 RDI: 00000000f70461cc RBP: 0000000000000081 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000000 R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000 INFO: task syz-executor.4:681 blocked for more than 145 seconds. Not tainted 5.16.0-syzkaller #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. task:syz-executor.4 state:D stack:29528 pid: 681 ppid: 3658 flags:0x20004000 Call Trace: context_switch kernel/sched/core.c:4986 [inline] __schedule+0xab2/0x4f00 kernel/sched/core.c:6296 schedule+0xd2/0x260 kernel/sched/core.c:6369 rwsem_down_read_slowpath+0x589/0xa70 kernel/locking/rwsem.c:1032 __down_read_common kernel/locking/rwsem.c:1214 [inline] __down_read kernel/locking/rwsem.c:1223 [inline] down_read+0xe2/0x440 kernel/locking/rwsem.c:1463 mmap_read_lock include/linux/mmap_lock.h:117 [inline] exit_mm kernel/exit.c:483 [inline] do_exit+0xa0a/0x2b40 kernel/exit.c:819 do_group_exit+0x125/0x310 kernel/exit.c:929 get_signal+0x47d/0x2220 kernel/signal.c:2852 arch_do_signal_or_restart+0x2a9/0x1c40 arch/x86/kernel/signal.c:868 handle_signal_work kernel/entry/common.c:148 [inline] exit_to_user_mode_loop kernel/entry/common.c:172 [inline] exit_to_user_mode_prepare+0x17d/0x290 kernel/entry/common.c:207 __syscall_exit_to_user_mode_work kernel/entry/common.c:289 [inline] syscall_exit_to_user_mode+0x19/0x60 kernel/entry/common.c:300 __do_fast_syscall_32+0x72/0xf0 arch/x86/entry/common.c:181 do_fast_syscall_32+0x2f/0x70 arch/x86/entry/common.c:203 entry_SYSENTER_compat_after_hwframe+0x4d/0x5c RIP: 0023:0xf6ee9549 RSP: 002b:00000000f583e67c EFLAGS: 00000296 ORIG_RAX: 00000000000000f0 RAX: fffffffffffffe00 RBX: 00000000f7046250 RCX: 0000000000000080 RDX: 0000000000000000 RSI: 0000000000000000 RDI: 00000000f7046254 RBP: 0000000000000081 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000000 R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000 Showing all locks held in the system: 1 lock held by khungtaskd/26: #0: ffffffff8bb854a0 (rcu_read_lock){....}-{1:2}, at: debug_show_all_locks+0x53/0x260 kernel/locking/lockdep.c:6460 2 locks held by getty/3291: #0: ffff888023917098 (&tty->ldisc_sem){++++}-{0:0}, at: tty_ldisc_ref_wait+0x22/0x80 drivers/tty/tty_ldisc.c:244 #1: ffffc90002b962e8 (&ldata->atomic_read_lock){+.+.}-{3:3}, at: n_tty_read+0xcf0/0x1230 drivers/tty/n_tty.c:2077 3 locks held by kworker/u4:23/16200: 1 lock held by syz-executor.4/674: #0: ffff8880759e7828 (&mm->mmap_lock#2){++++}-{3:3}, at: mmap_read_lock include/linux/mmap_lock.h:117 [inline] #0: ffff8880759e7828 (&mm->mmap_lock#2){++++}-{3:3}, at: exit_mm kernel/exit.c:483 [inline] #0: ffff8880759e7828 (&mm->mmap_lock#2){++++}-{3:3}, at: do_exit+0xa0a/0x2b40 kernel/exit.c:819 1 lock held by syz-executor.4/675: #0: ffff8880759e7828 (&mm->mmap_lock#2){++++}-{3:3}, at: mmap_read_lock include/linux/mmap_lock.h:117 [inline] #0: ffff8880759e7828 (&mm->mmap_lock#2){++++}-{3:3}, at: exit_mm kernel/exit.c:483 [inline] #0: ffff8880759e7828 (&mm->mmap_lock#2){++++}-{3:3}, at: do_exit+0xa0a/0x2b40 kernel/exit.c:819 2 locks held by syz-executor.4/677: 1 lock held by syz-executor.4/678: #0: ffff8880759e7828 (&mm->mmap_lock#2){++++}-{3:3}, at: mmap_read_lock include/linux/mmap_lock.h:117 [inline] #0: ffff8880759e7828 (&mm->mmap_lock#2){++++}-{3:3}, at: exit_mm kernel/exit.c:483 [inline] #0: ffff8880759e7828 (&mm->mmap_lock#2){++++}-{3:3}, at: do_exit+0xa0a/0x2b40 kernel/exit.c:819 1 lock held by syz-executor.4/679: #0: ffff8880759e7828 (&mm->mmap_lock#2){++++}-{3:3}, at: mmap_read_lock include/linux/mmap_lock.h:117 [inline] #0: ffff8880759e7828 (&mm->mmap_lock#2){++++}-{3:3}, at: exit_mm kernel/exit.c:483 [inline] #0: ffff8880759e7828 (&mm->mmap_lock#2){++++}-{3:3}, at: do_exit+0xa0a/0x2b40 kernel/exit.c:819 1 lock held by syz-executor.4/680: #0: ffff8880759e7828 (&mm->mmap_lock#2){++++}-{3:3}, at: mmap_read_lock include/linux/mmap_lock.h:117 [inline] #0: ffff8880759e7828 (&mm->mmap_lock#2){++++}-{3:3}, at: exit_mm kernel/exit.c:483 [inline] #0: ffff8880759e7828 (&mm->mmap_lock#2){++++}-{3:3}, at: do_exit+0xa0a/0x2b40 kernel/exit.c:819 1 lock held by syz-executor.4/681: #0: ffff8880759e7828 (&mm->mmap_lock#2){++++}-{3:3}, at: mmap_read_lock include/linux/mmap_lock.h:117 [inline] #0: ffff8880759e7828 (&mm->mmap_lock#2){++++}-{3:3}, at: exit_mm kernel/exit.c:483 [inline] #0: ffff8880759e7828 (&mm->mmap_lock#2){++++}-{3:3}, at: do_exit+0xa0a/0x2b40 kernel/exit.c:819 ============================================= NMI backtrace for cpu 0 CPU: 0 PID: 26 Comm: khungtaskd Not tainted 5.16.0-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Call Trace: __dump_stack lib/dump_stack.c:88 [inline] dump_stack_lvl+0xcd/0x134 lib/dump_stack.c:106 nmi_cpu_backtrace.cold+0x47/0x144 lib/nmi_backtrace.c:111 nmi_trigger_cpumask_backtrace+0x1b3/0x230 lib/nmi_backtrace.c:62 trigger_all_cpu_backtrace include/linux/nmi.h:146 [inline] check_hung_uninterruptible_tasks kernel/hung_task.c:210 [inline] watchdog+0xc1d/0xf50 kernel/hung_task.c:295 kthread+0x405/0x4f0 kernel/kthread.c:327 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:295 Sending NMI from CPU 0 to CPUs 1: NMI backtrace for cpu 1 CPU: 1 PID: 16199 Comm: kworker/u4:22 Not tainted 5.16.0-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Workqueue: 0x0 (phy14) RIP: 0010:lookup_object lib/debugobjects.c:198 [inline] RIP: 0010:debug_object_deactivate lib/debugobjects.c:737 [inline] RIP: 0010:debug_object_deactivate+0x145/0x300 lib/debugobjects.c:723 Code: 8b ab e0 fc 68 90 31 db 48 85 ed 74 44 49 bc 00 00 00 00 00 fc ff df 48 8d 7d 18 83 c3 01 48 89 f8 48 c1 e8 03 42 80 3c 20 00 <0f> 85 1e 01 00 00 4c 3b 7d 18 74 74 48 89 e8 48 c1 e8 03 42 80 3c RSP: 0018:ffffc9000f737c38 EFLAGS: 00000046 RAX: 1ffff1100e6bd650 RBX: 0000000000000003 RCX: ffffffff815d2760 RDX: 1ffffffff20ec4cb RSI: 0000000000000006 RDI: ffff8880735eb280 RBP: ffff8880735eb268 R08: ffffffff90762648 R09: 0000000000000003 R10: fffff52001ee6f75 R11: 0000000000000001 R12: dffffc0000000000 R13: ffffffff89ab3520 R14: 1ffff92001ee6f89 R15: ffff88807c951808 FS: 0000000000000000(0000) GS:ffff8880b9d00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007f587674d000 CR3: 000000007f0c9000 CR4: 00000000003506e0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: debug_work_deactivate kernel/workqueue.c:510 [inline] process_one_work+0x399/0x1650 kernel/workqueue.c:2237 worker_thread+0x657/0x1110 kernel/workqueue.c:2454 kthread+0x405/0x4f0 kernel/kthread.c:327 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:295 ---------------- Code disassembly (best guess): 0: 8b ab e0 fc 68 90 mov -0x6f970320(%rbx),%ebp 6: 31 db xor %ebx,%ebx 8: 48 85 ed test %rbp,%rbp b: 74 44 je 0x51 d: 49 bc 00 00 00 00 00 movabs $0xdffffc0000000000,%r12 14: fc ff df 17: 48 8d 7d 18 lea 0x18(%rbp),%rdi 1b: 83 c3 01 add $0x1,%ebx 1e: 48 89 f8 mov %rdi,%rax 21: 48 c1 e8 03 shr $0x3,%rax 25: 42 80 3c 20 00 cmpb $0x0,(%rax,%r12,1) * 2a: 0f 85 1e 01 00 00 jne 0x14e <-- trapping instruction 30: 4c 3b 7d 18 cmp 0x18(%rbp),%r15 34: 74 74 je 0xaa 36: 48 89 e8 mov %rbp,%rax 39: 48 c1 e8 03 shr $0x3,%rax 3d: 42 rex.X 3e: 80 .byte 0x80 3f: 3c .byte 0x3c