INFO: task syz-executor.0:28973 blocked for more than 143 seconds. Not tainted 5.15.0-rc4-syzkaller #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. task:syz-executor.0 state:D stack:26200 pid:28973 ppid: 6583 flags:0x00024004 Call Trace: context_switch kernel/sched/core.c:4940 [inline] __schedule+0x940/0x26f0 kernel/sched/core.c:6287 schedule+0xd3/0x270 kernel/sched/core.c:6366 schedule_timeout+0x1db/0x2a0 kernel/time/timer.c:1857 do_wait_for_common kernel/sched/completion.c:85 [inline] __wait_for_common kernel/sched/completion.c:106 [inline] wait_for_common kernel/sched/completion.c:117 [inline] wait_for_completion+0x176/0x280 kernel/sched/completion.c:138 io_wq_exit_workers fs/io-wq.c:1174 [inline] io_wq_put_and_exit+0x4b2/0xd20 fs/io-wq.c:1209 io_uring_clean_tctx fs/io_uring.c:9718 [inline] io_uring_cancel_generic+0x616/0x760 fs/io_uring.c:9798 io_uring_files_cancel include/linux/io_uring.h:16 [inline] do_exit+0x265/0x2a30 kernel/exit.c:780 do_group_exit+0x125/0x310 kernel/exit.c:922 get_signal+0x47f/0x2160 kernel/signal.c:2868 arch_do_signal_or_restart+0x2a9/0x1c40 arch/x86/kernel/signal.c:865 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_syscall_64+0x42/0xb0 arch/x86/entry/common.c:86 entry_SYSCALL_64_after_hwframe+0x44/0xae RIP: 0033:0x7fbf7e9b08d9 RSP: 002b:00007fbf7bf06188 EFLAGS: 00000246 ORIG_RAX: 00000000000001aa RAX: 0000000000000003 RBX: 00007fbf7eab5020 RCX: 00007fbf7e9b08d9 RDX: 0000000000000018 RSI: 00000000000045f5 RDI: 0000000000000004 RBP: 00007fbf7ea0acb4 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007fbf7efe8b2f R14: 00007fbf7bf06300 R15: 0000000000022000 Showing all locks held in the system: 1 lock held by khungtaskd/26: #0: ffffffff8b97fe20 (rcu_read_lock){....}-{1:2}, at: debug_show_all_locks+0x53/0x260 kernel/locking/lockdep.c:6446 5 locks held by kworker/u4:4/1073: 1 lock held by in:imklog/6257: ============================================= NMI backtrace for cpu 1 CPU: 1 PID: 26 Comm: khungtaskd Not tainted 5.15.0-rc4-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:105 nmi_trigger_cpumask_backtrace+0x1ae/0x220 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+0x3e5/0x4d0 kernel/kthread.c:319 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:295 Sending NMI from CPU 1 to CPUs 0: NMI backtrace for cpu 0 CPU: 0 PID: 6257 Comm: in:imklog Not tainted 5.15.0-rc4-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 RIP: 0010:__check_heap_object+0x13/0x160 mm/slub.c:4457 Code: ff 49 89 cd e9 ac fe ff ff e9 19 6d 37 07 66 0f 1f 84 00 00 00 00 00 41 54 41 89 cc 49 89 f0 48 b9 00 00 00 00 00 16 00 00 55 <53> 48 89 fb 48 83 ec 08 48 8b 05 be 67 76 09 48 8b 6a 18 48 01 ca RSP: 0018:ffffc9000b0a7a98 EFLAGS: 00000293 RAX: 0000000000000000 RBX: 0000000000000030 RCX: 0000160000000000 RDX: ffffea0001d4be00 RSI: 0000000000000030 RDI: ffff8880752fe000 RBP: ffff8880752fe030 R08: 0000000000000030 R09: 0000000000000001 R10: ffffffff81c66682 R11: 0000000000000000 R12: 0000000000000001 R13: 0000000000000001 R14: ffffea0001d4be00 R15: 0000000000000001 FS: 00007f6777572700(0000) GS:ffff8880b9c00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007f35b6a45000 CR3: 000000001960a000 CR4: 00000000003506f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: check_heap_object mm/usercopy.c:240 [inline] __check_object_size mm/usercopy.c:286 [inline] __check_object_size+0x331/0x3f0 mm/usercopy.c:256 check_object_size include/linux/thread_info.h:185 [inline] check_copy_size include/linux/thread_info.h:218 [inline] copy_to_user include/linux/uaccess.h:199 [inline] syslog_print+0x378/0x580 kernel/printk/printk.c:1553 do_syslog.part.0+0x202/0x640 kernel/printk/printk.c:1655 do_syslog+0x49/0x60 kernel/printk/printk.c:1640 kmsg_read+0x90/0xb0 fs/proc/kmsg.c:40 pde_read fs/proc/inode.c:311 [inline] proc_reg_read+0x119/0x300 fs/proc/inode.c:321 vfs_read+0x1b5/0x600 fs/read_write.c:483 ksys_read+0x12d/0x250 fs/read_write.c:623 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x35/0xb0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x44/0xae RIP: 0033:0x7f6779bb522d Code: c1 20 00 00 75 10 b8 00 00 00 00 0f 05 48 3d 01 f0 ff ff 73 31 c3 48 83 ec 08 e8 4e fc ff ff 48 89 04 24 b8 00 00 00 00 0f 05 <48> 8b 3c 24 48 89 c2 e8 97 fc ff ff 48 89 d0 48 83 c4 08 48 3d 01 RSP: 002b:00007f6777551580 EFLAGS: 00000293 ORIG_RAX: 0000000000000000 RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 00007f6779bb522d RDX: 0000000000001fa0 RSI: 00007f6777551da0 RDI: 0000000000000004 RBP: 000055666259a9d0 R08: 0000000000000000 R09: 0000000000000000 R10: 2ce33e6c02ce33e7 R11: 0000000000000293 R12: 00007f6777551da0 R13: 0000000000001fa0 R14: 0000000000001f9f R15: 00007f6777551e03 ---------------- Code disassembly (best guess), 1 bytes skipped: 0: 49 89 cd mov %rcx,%r13 3: e9 ac fe ff ff jmpq 0xfffffeb4 8: e9 19 6d 37 07 jmpq 0x7376d26 d: 66 0f 1f 84 00 00 00 nopw 0x0(%rax,%rax,1) 14: 00 00 16: 41 54 push %r12 18: 41 89 cc mov %ecx,%r12d 1b: 49 89 f0 mov %rsi,%r8 1e: 48 b9 00 00 00 00 00 movabs $0x160000000000,%rcx 25: 16 00 00 28: 55 push %rbp * 29: 53 push %rbx <-- trapping instruction 2a: 48 89 fb mov %rdi,%rbx 2d: 48 83 ec 08 sub $0x8,%rsp 31: 48 8b 05 be 67 76 09 mov 0x97667be(%rip),%rax # 0x97667f6 38: 48 8b 6a 18 mov 0x18(%rdx),%rbp 3c: 48 01 ca add %rcx,%rdx