------------[ cut here ]------------
======================================================
WARNING: possible circular locking dependency detected
syzkaller #0 Not tainted
------------------------------------------------------
syz.0.78/6144 is trying to acquire lock:
ffffffff8e6f1420 (console_owner){-...}-{0:0}, at: console_lock_spinning_enable+0x61/0x80 kernel/printk/printk.c:1902

but task is already holding lock:
ffff8880b843b3e0 (&rq->__lock){-.-.}-{2:2}, at: raw_spin_rq_lock_nested kernel/sched/core.c:660 [inline]
ffff8880b843b3e0 (&rq->__lock){-.-.}-{2:2}, at: raw_spin_rq_lock_nested+0x88/0x140 kernel/sched/core.c:644

which lock already depends on the new lock.


the existing dependency chain (in reverse order) is:

-> #4 (&rq->__lock){-.-.}-{2:2}:
       _raw_spin_lock_nested+0x31/0x40 kernel/locking/spinlock.c:382
       raw_spin_rq_lock_nested+0x2c/0x140 kernel/sched/core.c:652
       raw_spin_rq_lock kernel/sched/sched.h:1624 [inline]
       _task_rq_lock+0xcf/0x510 kernel/sched/core.c:747
       cgroup_move_task+0x81/0x320 kernel/sched/psi.c:1170
       css_set_move_task+0x285/0x600 kernel/cgroup/cgroup.c:887
       cgroup_post_fork+0x202/0x9b0 kernel/cgroup/cgroup.c:6952
       copy_process+0x5b91/0x7e00 kernel/fork.c:2524
       kernel_clone+0x12e/0x9c0 kernel/fork.c:2721
       user_mode_thread+0xcc/0x110 kernel/fork.c:2797
       rest_init+0x21/0x260 init/main.c:727
       start_kernel+0x484/0x490 init/main.c:1220
       x86_64_start_reservations+0x24/0x30 arch/x86/kernel/head64.c:310
       x86_64_start_kernel+0x12b/0x130 arch/x86/kernel/head64.c:291
       common_startup_64+0x13e/0x148

-> #3 (&p->pi_lock){-.-.}-{2:2}:
       __raw_spin_lock_irqsave include/linux/spinlock_api_smp.h:132 [inline]
       _raw_spin_lock_irqsave+0x3a/0x60 kernel/locking/spinlock.c:166
       class_raw_spinlock_irqsave_constructor include/linux/spinlock.h:571 [inline]
       try_to_wake_up+0xb5/0x1900 kernel/sched/core.c:4190
       __wake_up_common+0x135/0x1f0 kernel/sched/wait.c:108
       __wake_up_common_lock kernel/sched/wait.c:125 [inline]
       __wake_up+0x31/0x60 kernel/sched/wait.c:146
       pty_close+0x281/0x500 drivers/tty/pty.c:67
       tty_release+0x40e/0x1300 drivers/tty/tty_io.c:1745
       __fput+0x3ff/0xb50 fs/file_table.c:510
       task_work_run+0x150/0x240 kernel/task_work.c:233
       resume_user_mode_work include/linux/resume_user_mode.h:50 [inline]
       __exit_to_user_mode_loop kernel/entry/common.c:67 [inline]
       exit_to_user_mode_loop+0x100/0x4a0 kernel/entry/common.c:98
       __exit_to_user_mode_prepare include/linux/irq-entry-common.h:207 [inline]
       syscall_exit_to_user_mode_prepare include/linux/irq-entry-common.h:238 [inline]
       syscall_exit_to_user_mode include/linux/entry-common.h:318 [inline]
       do_syscall_64+0x6f2/0xf80 arch/x86/entry/syscall_64.c:100
       entry_SYSCALL_64_after_hwframe+0x77/0x7f

-> #2 (&tty->write_wait){-.-.}-{3:3}:
       __raw_spin_lock_irqsave include/linux/spinlock_api_smp.h:132 [inline]
       _raw_spin_lock_irqsave+0x3a/0x60 kernel/locking/spinlock.c:166
       __wake_up_common_lock kernel/sched/wait.c:124 [inline]
       __wake_up+0x1c/0x60 kernel/sched/wait.c:146
       tty_port_default_wakeup+0x52/0x70 drivers/tty/tty_port.c:67
       serial8250_tx_chars+0x68f/0x860 drivers/tty/serial/8250/8250_port.c:1721
       serial8250_handle_irq_locked+0x5e6/0x7e0 drivers/tty/serial/8250/8250_port.c:1825
       serial8250_handle_irq.part.0+0xb4/0x530 drivers/tty/serial/8250/8250_port.c:1841
       serial8250_handle_irq drivers/tty/serial/8250/8250_port.c:1837 [inline]
       serial8250_default_handle_irq+0xc2/0x290 drivers/tty/serial/8250/8250_port.c:1855
       serial8250_interrupt+0xf8/0x1c0 drivers/tty/serial/8250/8250_core.c:86
       __handle_irq_event_percpu+0x235/0x8c0 kernel/irq/handle.c:209
       handle_irq_event_percpu kernel/irq/handle.c:246 [inline]
       handle_irq_event+0xab/0x1e0 kernel/irq/handle.c:263
       handle_edge_irq+0x35e/0x960 kernel/irq/chip.c:856
       generic_handle_irq_desc include/linux/irqdesc.h:186 [inline]
       handle_irq arch/x86/kernel/irq.c:262 [inline]
       call_irq_handler arch/x86/kernel/irq.c:318 [inline]
       __common_interrupt+0xd8/0x2f0 arch/x86/kernel/irq.c:333
       common_interrupt+0xb9/0xe0 arch/x86/kernel/irq.c:326
       asm_common_interrupt+0x26/0x40 arch/x86/include/asm/idtentry.h:688
       __raw_spin_unlock_irqrestore include/linux/spinlock_api_smp.h:178 [inline]
       _raw_spin_unlock_irqrestore+0x31/0x80 kernel/locking/spinlock.c:198
       spin_unlock_irqrestore include/linux/spinlock.h:408 [inline]
       uart_port_unlock_irqrestore include/linux/serial_core.h:788 [inline]
       uart_port_unlock_deref drivers/tty/serial/serial_core.c:91 [inline]
       uart_port_unlock_deref drivers/tty/serial/serial_core.c:88 [inline]
       uart_write+0x29d/0xb20 drivers/tty/serial/serial_core.c:634
       process_output_block drivers/tty/n_tty.c:557 [inline]
       n_tty_write+0x431/0x11c0 drivers/tty/n_tty.c:2366
       iterate_tty_write drivers/tty/tty_io.c:1006 [inline]
       file_tty_write.isra.0+0x4d2/0x890 drivers/tty/tty_io.c:1081
       tty_write drivers/tty/tty_io.c:1102 [inline]
       redirected_tty_write drivers/tty/tty_io.c:1125 [inline]
       redirected_tty_write+0xd4/0x120 drivers/tty/tty_io.c:1105
       new_sync_write fs/read_write.c:595 [inline]
       vfs_write+0x6ac/0x1070 fs/read_write.c:688
       ksys_write+0x12a/0x250 fs/read_write.c:740
       do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
       do_syscall_64+0x10b/0xf80 arch/x86/entry/syscall_64.c:94
       entry_SYSCALL_64_after_hwframe+0x77/0x7f

-> #1 (&port_lock_key){-.-.}-{3:3}:
       __raw_spin_lock_irqsave include/linux/spinlock_api_smp.h:132 [inline]
       _raw_spin_lock_irqsave+0x3a/0x60 kernel/locking/spinlock.c:166
       uart_port_lock_irqsave include/linux/serial_core.h:717 [inline]
       serial8250_console_write+0x17e/0x1900 drivers/tty/serial/8250/8250_port.c:3316
       console_emit_next_record kernel/printk/printk.c:3183 [inline]
       console_flush_one_record+0x790/0xe50 kernel/printk/printk.c:3269
       console_flush_all kernel/printk/printk.c:3343 [inline]
       __console_flush_and_unlock kernel/printk/printk.c:3373 [inline]
       console_unlock+0x103/0x260 kernel/printk/printk.c:3413
       vprintk_emit+0x407/0x6b0 kernel/printk/printk.c:2479
       _printk+0xcf/0x110 kernel/printk/printk.c:2504
       register_console.cold+0xc0/0x248 kernel/printk/printk.c:4208
       univ8250_console_init+0x6f/0x80 drivers/tty/serial/8250/8250_core.c:515
       console_init+0x3f7/0x5e0 kernel/printk/printk.c:4407
       start_kernel+0x30a/0x490 init/main.c:1157
       x86_64_start_reservations+0x24/0x30 arch/x86/kernel/head64.c:310
       x86_64_start_kernel+0x12b/0x130 arch/x86/kernel/head64.c:291
       common_startup_64+0x13e/0x148

-> #0 (console_owner){-...}-{0:0}:
       check_prev_add kernel/locking/lockdep.c:3165 [inline]
       check_prevs_add kernel/locking/lockdep.c:3284 [inline]
       validate_chain kernel/locking/lockdep.c:3908 [inline]
       __lock_acquire+0x14b8/0x2630 kernel/locking/lockdep.c:5237
       lock_acquire kernel/locking/lockdep.c:5868 [inline]
       lock_acquire+0x1b1/0x370 kernel/locking/lockdep.c:5825
       console_lock_spinning_enable+0x72/0x80 kernel/printk/printk.c:1902
       console_emit_next_record kernel/printk/printk.c:3177 [inline]
       console_flush_one_record+0x739/0xe50 kernel/printk/printk.c:3269
       console_flush_all kernel/printk/printk.c:3343 [inline]
       __console_flush_and_unlock kernel/printk/printk.c:3373 [inline]
       console_unlock+0x103/0x260 kernel/printk/printk.c:3413
       vprintk_emit+0x407/0x6b0 kernel/printk/printk.c:2479
       _printk+0xcf/0x110 kernel/printk/printk.c:2504
       __report_bug.cold+0x15/0x137 lib/bug.c:240
       report_bug+0xb2/0x220 lib/bug.c:278
       handle_bug+0x16a/0x2a0 arch/x86/kernel/traps.c:436
       exc_invalid_op+0x17/0x50 arch/x86/kernel/traps.c:490
       asm_exc_invalid_op+0x1a/0x20 arch/x86/include/asm/idtentry.h:616
       lockdep_assert_rq_held kernel/sched/sched.h:1612 [inline]
       lockdep_assert_rq_held kernel/sched/sched.h:1609 [inline]
       update_rq_clock+0x40a/0xd20 kernel/sched/core.c:850
       pick_next_task kernel/sched/core.c:6221 [inline]
       __schedule+0x1cd8/0x6820 kernel/sched/core.c:7104
       preempt_schedule_irq+0x50/0x90 kernel/sched/core.c:7512
       irqentry_exit_to_kernel_mode_preempt include/linux/irq-entry-common.h:476 [inline]
       irqentry_exit_to_kernel_mode include/linux/irq-entry-common.h:547 [inline]
       irqentry_exit+0x1fe/0x790 kernel/entry/common.c:164
       asm_sysvec_reschedule_ipi+0x1a/0x20 arch/x86/include/asm/idtentry.h:702
       check_kcov_mode kernel/kcov.c:185 [inline]
       __sanitizer_cov_trace_pc+0x3f/0x70 kernel/kcov.c:217
       generic_perform_write+0x1f2/0xa40 mm/filemap.c:4316
       shmem_file_write_iter+0x10e/0x140 mm/shmem.c:3478
       __kernel_write_iter+0x2ac/0x920 fs/read_write.c:621
       dump_emit_page fs/coredump.c:1304 [inline]
       dump_user_range+0x3f9/0xad0 fs/coredump.c:1378
       elf_core_dump+0x2d5f/0x3d10 fs/binfmt_elf.c:2109
       coredump_write fs/coredump.c:1053 [inline]
       do_coredump fs/coredump.c:1132 [inline]
       vfs_coredump+0x29a0/0x5770 fs/coredump.c:1206
       get_signal+0x1f2a/0x21e0 kernel/signal.c:3022
       arch_do_signal_or_restart+0x91/0x770 arch/x86/kernel/signal.c:337
       __exit_to_user_mode_loop kernel/entry/common.c:64 [inline]
       exit_to_user_mode_loop kernel/entry/common.c:98 [inline]
       __exit_to_user_mode_prepare include/linux/irq-entry-common.h:207 [inline]
       irqentry_exit_to_user_mode_prepare include/linux/irq-entry-common.h:252 [inline]
       irqentry_exit_to_user_mode include/linux/irq-entry-common.h:323 [inline]
       irqentry_exit+0x403/0x790 kernel/entry/common.c:162
       asm_exc_page_fault+0x26/0x30 arch/x86/include/asm/idtentry.h:618

other info that might help us debug this:

Chain exists of:
  console_owner --> &p->pi_lock --> &rq->__lock

 Possible unsafe locking scenario:

       CPU0                    CPU1
       ----                    ----
  lock(&rq->__lock);
                               lock(&p->pi_lock);
                               lock(&rq->__lock);
  lock(console_owner);

 *** DEADLOCK ***

5 locks held by syz.0.78/6144:
 #0: ffff88807a912410 (sb_writers#5){.+.+}-{0:0}, at: get_signal+0x1f2a/0x21e0 kernel/signal.c:3022
 #1: ffff8880383a32c0 (&sb->s_type->i_mutex_key#15){+.+.}-{4:4}, at: inode_lock include/linux/fs.h:1029 [inline]
 #1: ffff8880383a32c0 (&sb->s_type->i_mutex_key#15){+.+.}-{4:4}, at: shmem_file_write_iter+0x86/0x140 mm/shmem.c:3468
 #2: ffff8880b843b3e0 (&rq->__lock){-.-.}-{2:2}, at: raw_spin_rq_lock_nested kernel/sched/core.c:660 [inline]
 #2: ffff8880b843b3e0 (&rq->__lock){-.-.}-{2:2}, at: raw_spin_rq_lock_nested+0x88/0x140 kernel/sched/core.c:644
 #3: ffffffff8e7d1860 (console_lock){+.+.}-{0:0}, at: _printk+0xcf/0x110 kernel/printk/printk.c:2504
 #4: ffffffff8e7d18d8 (console_srcu){....}-{0:0}, at: rcu_try_lock_acquire include/linux/rcupdate.h:305 [inline]
 #4: ffffffff8e7d18d8 (console_srcu){....}-{0:0}, at: srcu_read_lock_nmisafe include/linux/srcu.h:428 [inline]
 #4: ffffffff8e7d18d8 (console_srcu){....}-{0:0}, at: console_srcu_read_lock kernel/printk/printk.c:291 [inline]
 #4: ffffffff8e7d18d8 (console_srcu){....}-{0:0}, at: console_flush_one_record+0xfd/0xe50 kernel/printk/printk.c:3246

stack backtrace:
CPU: 0 UID: 0 PID: 6144 Comm: syz.0.78 Not tainted syzkaller #0 PREEMPT(full) 
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 04/18/2026
Call Trace:
 <TASK>
 __dump_stack lib/dump_stack.c:94 [inline]
 dump_stack_lvl+0x100/0x190 lib/dump_stack.c:120
 print_circular_bug.cold+0x178/0x1c7 kernel/locking/lockdep.c:2043
 check_noncircular+0x146/0x160 kernel/locking/lockdep.c:2175
 check_prev_add kernel/locking/lockdep.c:3165 [inline]
 check_prevs_add kernel/locking/lockdep.c:3284 [inline]
 validate_chain kernel/locking/lockdep.c:3908 [inline]
 __lock_acquire+0x14b8/0x2630 kernel/locking/lockdep.c:5237
 lock_acquire kernel/locking/lockdep.c:5868 [inline]
 lock_acquire+0x1b1/0x370 kernel/locking/lockdep.c:5825
 console_lock_spinning_enable+0x72/0x80 kernel/printk/printk.c:1902
 console_emit_next_record kernel/printk/printk.c:3177 [inline]
 console_flush_one_record+0x739/0xe50 kernel/printk/printk.c:3269
 console_flush_all kernel/printk/printk.c:3343 [inline]
 __console_flush_and_unlock kernel/printk/printk.c:3373 [inline]
 console_unlock+0x103/0x260 kernel/printk/printk.c:3413
 vprintk_emit+0x407/0x6b0 kernel/printk/printk.c:2479
 _printk+0xcf/0x110 kernel/printk/printk.c:2504
 __report_bug.cold+0x15/0x137 lib/bug.c:240
 report_bug+0xb2/0x220 lib/bug.c:278
 handle_bug+0x16a/0x2a0 arch/x86/kernel/traps.c:436
 exc_invalid_op+0x17/0x50 arch/x86/kernel/traps.c:490
 asm_exc_invalid_op+0x1a/0x20 arch/x86/include/asm/idtentry.h:616
RIP: 0010:lockdep_assert_rq_held kernel/sched/sched.h:1612 [inline]
RIP: 0010:lockdep_assert_rq_held kernel/sched/sched.h:1609 [inline]
RIP: 0010:update_rq_clock+0x40a/0xd20 kernel/sched/core.c:850
Code: ab 88 0b 00 00 48 83 c4 18 5b 5d 41 5c 41 5d 41 5e 41 5f c3 cc cc cc cc a8 04 0f 84 df fc ff ff 90 0f 0b 90 e9 d6 fc ff ff 90 <0f> 0b 90 e9 92 fc ff ff 4c 8d 83 80 0b 00 00 48 b8 00 00 00 00 00
RSP: 0018:ffffc90006b4ebc8 EFLAGS: 00010046
RAX: 0000000000000000 RBX: ffff8880b853b380 RCX: 0000000000000001
RDX: 0000000000000046 RSI: ffffffff8def5ccc RDI: ffffffff8c1c2480
RBP: ffffc90006b4ed78 R08: 0000000000000001 R09: 0000000000000001
R10: ffffffff90d7c757 R11: 0000000000000000 R12: ffffffff90d7fac4
R13: ffff8880b853c220 R14: ffff88801e681ec0 R15: ffff8880b853b380
 pick_next_task kernel/sched/core.c:6221 [inline]
 __schedule+0x1cd8/0x6820 kernel/sched/core.c:7104
 preempt_schedule_irq+0x50/0x90 kernel/sched/core.c:7512
 irqentry_exit_to_kernel_mode_preempt include/linux/irq-entry-common.h:476 [inline]
 irqentry_exit_to_kernel_mode include/linux/irq-entry-common.h:547 [inline]
 irqentry_exit+0x1fe/0x790 kernel/entry/common.c:164
 asm_sysvec_reschedule_ipi+0x1a/0x20 arch/x86/include/asm/idtentry.h:702
RIP: 0010:__sanitizer_cov_trace_pc+0x3f/0x70 kernel/kcov.c:217
Code: 02 12 a9 00 01 ff 00 74 1b f6 c4 01 74 07 a9 00 00 ff 00 74 05 c3 cc cc cc cc 8b 82 cc 16 00 00 85 c0 74 f1 8b 82 a8 16 00 00 <83> f8 02 75 e6 48 8b 8a b0 16 00 00 8b 92 ac 16 00 00 48 8b 01 48
RSP: 0018:ffffc90006b4ee80 EFLAGS: 00000246
RAX: 0000000000000000 RBX: ffffc90006b4f030 RCX: ffffc90006b4f1a0
RDX: ffff88802ec78000 RSI: ffffffff82425e32 RDI: 1ffffffff177cd60
RBP: ffff88802c742000 R08: 0000000000000007 R09: 0000000000000000
R10: 0000000000000000 R11: ffffffff8bbe6ae0 R12: 0000000000001000
R13: ffffc90006b4ef78 R14: dffffc0000000000 R15: 00000000032a6000
 generic_perform_write+0x1f2/0xa40 mm/filemap.c:4316
 shmem_file_write_iter+0x10e/0x140 mm/shmem.c:3478
 __kernel_write_iter+0x2ac/0x920 fs/read_write.c:621
 dump_emit_page fs/coredump.c:1304 [inline]
 dump_user_range+0x3f9/0xad0 fs/coredump.c:1378
 elf_core_dump+0x2d5f/0x3d10 fs/binfmt_elf.c:2109
 coredump_write fs/coredump.c:1053 [inline]
 do_coredump fs/coredump.c:1132 [inline]
 vfs_coredump+0x29a0/0x5770 fs/coredump.c:1206
 get_signal+0x1f2a/0x21e0 kernel/signal.c:3022
 arch_do_signal_or_restart+0x91/0x770 arch/x86/kernel/signal.c:337
 __exit_to_user_mode_loop kernel/entry/common.c:64 [inline]
 exit_to_user_mode_loop kernel/entry/common.c:98 [inline]
 __exit_to_user_mode_prepare include/linux/irq-entry-common.h:207 [inline]
 irqentry_exit_to_user_mode_prepare include/linux/irq-entry-common.h:252 [inline]
 irqentry_exit_to_user_mode include/linux/irq-entry-common.h:323 [inline]
 irqentry_exit+0x403/0x790 kernel/entry/common.c:162
 asm_exc_page_fault+0x26/0x30 arch/x86/include/asm/idtentry.h:618
RIP: 0033:0x0
Code: Unable to access opcode bytes at 0xffffffffffffffd6.
RSP: 002b:0000000000000011 EFLAGS: 00010217
RAX: 0000000000000000 RBX: 00007f36a2216090 RCX: 00007f36a1f9cdd9
RDX: 0000200000000280 RSI: 0000000000000009 RDI: 0000000000000001
RBP: 00007f36a2032d69 R08: 0000000000000008 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f36a2216128 R14: 00007f36a2216090 R15: 00007ffc22e107e8
 </TASK>
debug_locks && !(lock_is_held(&(__rq_lockp(rq))->dep_map) != 0)
WARNING: kernel/sched/sched.h:1612 at lockdep_assert_rq_held kernel/sched/sched.h:1612 [inline], CPU#0: syz.0.78/6144
WARNING: kernel/sched/sched.h:1612 at lockdep_assert_rq_held kernel/sched/sched.h:1609 [inline], CPU#0: syz.0.78/6144
WARNING: kernel/sched/sched.h:1612 at update_rq_clock+0x40a/0xd20 kernel/sched/core.c:850, CPU#0: syz.0.78/6144
Modules linked in:
CPU: 0 UID: 0 PID: 6144 Comm: syz.0.78 Not tainted syzkaller #0 PREEMPT(full) 
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 04/18/2026
RIP: 0010:lockdep_assert_rq_held kernel/sched/sched.h:1612 [inline]
RIP: 0010:lockdep_assert_rq_held kernel/sched/sched.h:1609 [inline]
RIP: 0010:update_rq_clock+0x40a/0xd20 kernel/sched/core.c:850
Code: ab 88 0b 00 00 48 83 c4 18 5b 5d 41 5c 41 5d 41 5e 41 5f c3 cc cc cc cc a8 04 0f 84 df fc ff ff 90 0f 0b 90 e9 d6 fc ff ff 90 <0f> 0b 90 e9 92 fc ff ff 4c 8d 83 80 0b 00 00 48 b8 00 00 00 00 00
RSP: 0018:ffffc90006b4ebc8 EFLAGS: 00010046
RAX: 0000000000000000 RBX: ffff8880b853b380 RCX: 0000000000000001
RDX: 0000000000000046 RSI: ffffffff8def5ccc RDI: ffffffff8c1c2480
RBP: ffffc90006b4ed78 R08: 0000000000000001 R09: 0000000000000001
R10: ffffffff90d7c757 R11: 0000000000000000 R12: ffffffff90d7fac4
R13: ffff8880b853c220 R14: ffff88801e681ec0 R15: ffff8880b853b380
FS:  00007f36a2e7c6c0(0000) GS:ffff88812437d000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000001b34201ff8 CR3: 000000002b788000 CR4: 00000000003526f0
Call Trace:
 <TASK>
 pick_next_task kernel/sched/core.c:6221 [inline]
 __schedule+0x1cd8/0x6820 kernel/sched/core.c:7104
 preempt_schedule_irq+0x50/0x90 kernel/sched/core.c:7512
 irqentry_exit_to_kernel_mode_preempt include/linux/irq-entry-common.h:476 [inline]
 irqentry_exit_to_kernel_mode include/linux/irq-entry-common.h:547 [inline]
 irqentry_exit+0x1fe/0x790 kernel/entry/common.c:164
 asm_sysvec_reschedule_ipi+0x1a/0x20 arch/x86/include/asm/idtentry.h:702
RIP: 0010:__sanitizer_cov_trace_pc+0x3f/0x70 kernel/kcov.c:217
Code: 02 12 a9 00 01 ff 00 74 1b f6 c4 01 74 07 a9 00 00 ff 00 74 05 c3 cc cc cc cc 8b 82 cc 16 00 00 85 c0 74 f1 8b 82 a8 16 00 00 <83> f8 02 75 e6 48 8b 8a b0 16 00 00 8b 92 ac 16 00 00 48 8b 01 48
RSP: 0018:ffffc90006b4ee80 EFLAGS: 00000246
RAX: 0000000000000000 RBX: ffffc90006b4f030 RCX: ffffc90006b4f1a0
RDX: ffff88802ec78000 RSI: ffffffff82425e32 RDI: 1ffffffff177cd60
RBP: ffff88802c742000 R08: 0000000000000007 R09: 0000000000000000
R10: 0000000000000000 R11: ffffffff8bbe6ae0 R12: 0000000000001000
R13: ffffc90006b4ef78 R14: dffffc0000000000 R15: 00000000032a6000
 generic_perform_write+0x1f2/0xa40 mm/filemap.c:4316
 shmem_file_write_iter+0x10e/0x140 mm/shmem.c:3478
 __kernel_write_iter+0x2ac/0x920 fs/read_write.c:621
 dump_emit_page fs/coredump.c:1304 [inline]
 dump_user_range+0x3f9/0xad0 fs/coredump.c:1378
 elf_core_dump+0x2d5f/0x3d10 fs/binfmt_elf.c:2109
 coredump_write fs/coredump.c:1053 [inline]
 do_coredump fs/coredump.c:1132 [inline]
 vfs_coredump+0x29a0/0x5770 fs/coredump.c:1206
 get_signal+0x1f2a/0x21e0 kernel/signal.c:3022
 arch_do_signal_or_restart+0x91/0x770 arch/x86/kernel/signal.c:337
 __exit_to_user_mode_loop kernel/entry/common.c:64 [inline]
 exit_to_user_mode_loop kernel/entry/common.c:98 [inline]
 __exit_to_user_mode_prepare include/linux/irq-entry-common.h:207 [inline]
 irqentry_exit_to_user_mode_prepare include/linux/irq-entry-common.h:252 [inline]
 irqentry_exit_to_user_mode include/linux/irq-entry-common.h:323 [inline]
 irqentry_exit+0x403/0x790 kernel/entry/common.c:162
 asm_exc_page_fault+0x26/0x30 arch/x86/include/asm/idtentry.h:618
RIP: 0033:0x0
Code: Unable to access opcode bytes at 0xffffffffffffffd6.
RSP: 002b:0000000000000011 EFLAGS: 00010217
RAX: 0000000000000000 RBX: 00007f36a2216090 RCX: 00007f36a1f9cdd9
RDX: 0000200000000280 RSI: 0000000000000009 RDI: 0000000000000001
RBP: 00007f36a2032d69 R08: 0000000000000008 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f36a2216128 R14: 00007f36a2216090 R15: 00007ffc22e107e8
 </TASK>
----------------
Code disassembly (best guess):
   0:	02 12                	add    (%rdx),%dl
   2:	a9 00 01 ff 00       	test   $0xff0100,%eax
   7:	74 1b                	je     0x24
   9:	f6 c4 01             	test   $0x1,%ah
   c:	74 07                	je     0x15
   e:	a9 00 00 ff 00       	test   $0xff0000,%eax
  13:	74 05                	je     0x1a
  15:	c3                   	ret
  16:	cc                   	int3
  17:	cc                   	int3
  18:	cc                   	int3
  19:	cc                   	int3
  1a:	8b 82 cc 16 00 00    	mov    0x16cc(%rdx),%eax
  20:	85 c0                	test   %eax,%eax
  22:	74 f1                	je     0x15
  24:	8b 82 a8 16 00 00    	mov    0x16a8(%rdx),%eax
* 2a:	83 f8 02             	cmp    $0x2,%eax <-- trapping instruction
  2d:	75 e6                	jne    0x15
  2f:	48 8b 8a b0 16 00 00 	mov    0x16b0(%rdx),%rcx
  36:	8b 92 ac 16 00 00    	mov    0x16ac(%rdx),%edx
  3c:	48 8b 01             	mov    (%rcx),%rax
  3f:	48                   	rex.W