FAULT_INJECTION: forcing a failure.
name fail_usercopy, interval 1, probability 0, space 0, times 1
======================================================
WARNING: possible circular locking dependency detected
6.8.0-syzkaller-05236-g443574b03387 #0 Not tainted
------------------------------------------------------
syz-executor.2/11532 is trying to acquire lock:
ffffffff8e125be0 (console_owner){-...}-{0:0}, at: rcu_try_lock_acquire include/linux/rcupdate.h:303 [inline]
ffffffff8e125be0 (console_owner){-...}-{0:0}, at: srcu_read_lock_nmisafe include/linux/srcu.h:232 [inline]
ffffffff8e125be0 (console_owner){-...}-{0:0}, at: console_srcu_read_lock kernel/printk/printk.c:286 [inline]
ffffffff8e125be0 (console_owner){-...}-{0:0}, at: console_flush_all+0x14a/0xec0 kernel/printk/printk.c:2948

but task is already holding lock:
ffff8880b943e158 (&rq->__lock){-.-.}-{2:2}, at: raw_spin_rq_lock_nested+0x2a/0x140 kernel/sched/core.c:559

which lock already depends on the new lock.


the existing dependency chain (in reverse order) is:

-> #4 (&rq->__lock){-.-.}-{2:2}:
       lock_acquire+0x1e4/0x530 kernel/locking/lockdep.c:5754
       _raw_spin_lock_nested+0x31/0x40 kernel/locking/spinlock.c:378
       raw_spin_rq_lock_nested+0x2a/0x140 kernel/sched/core.c:559
       raw_spin_rq_lock kernel/sched/sched.h:1385 [inline]
       rq_lock kernel/sched/sched.h:1699 [inline]
       task_fork_fair+0x61/0x1e0 kernel/sched/fair.c:12629
       sched_cgroup_fork+0x37c/0x410 kernel/sched/core.c:4845
       copy_process+0x2217/0x3df0 kernel/fork.c:2498
       kernel_clone+0x21e/0x8d0 kernel/fork.c:2796
       user_mode_thread+0x132/0x1a0 kernel/fork.c:2874
       rest_init+0x27/0x300 init/main.c:695
       arch_call_rest_init+0xe/0x10 init/main.c:831
       start_kernel+0x47a/0x500 init/main.c:1077
       x86_64_start_reservations+0x2a/0x30 arch/x86/kernel/head64.c:509
       x86_64_start_kernel+0x99/0xa0 arch/x86/kernel/head64.c:490
       common_startup_64+0x13e/0x147

-> #3 (&p->pi_lock){-.-.}-{2:2}:
       lock_acquire+0x1e4/0x530 kernel/locking/lockdep.c:5754
       __raw_spin_lock_irqsave include/linux/spinlock_api_smp.h:110 [inline]
       _raw_spin_lock_irqsave+0xd5/0x120 kernel/locking/spinlock.c:162
       class_raw_spinlock_irqsave_constructor include/linux/spinlock.h:553 [inline]
       try_to_wake_up+0xb0/0x1470 kernel/sched/core.c:4262
       __wake_up_common kernel/sched/wait.c:89 [inline]
       __wake_up_common_lock+0x130/0x1e0 kernel/sched/wait.c:106
       tty_port_default_wakeup+0xa6/0xf0 drivers/tty/tty_port.c:69
       serial8250_tx_chars+0x6ad/0x8a0 drivers/tty/serial/8250/8250_port.c:1835
       serial8250_handle_irq+0x558/0x710 drivers/tty/serial/8250/8250_port.c:1942
       serial8250_default_handle_irq+0xd1/0x1f0 drivers/tty/serial/8250/8250_port.c:1962
       serial8250_interrupt+0xa9/0x1f0 drivers/tty/serial/8250/8250_core.c:127
       __handle_irq_event_percpu+0x28a/0xa30 kernel/irq/handle.c:158
       handle_irq_event_percpu kernel/irq/handle.c:193 [inline]
       handle_irq_event+0x89/0x1f0 kernel/irq/handle.c:210
       handle_edge_irq+0x25f/0xc20 kernel/irq/chip.c:831
       generic_handle_irq_desc include/linux/irqdesc.h:161 [inline]
       handle_irq arch/x86/kernel/irq.c:238 [inline]
       __common_interrupt+0x138/0x230 arch/x86/kernel/irq.c:257
       common_interrupt+0xa5/0xd0 arch/x86/kernel/irq.c:247
       asm_common_interrupt+0x26/0x40 arch/x86/include/asm/idtentry.h:693
       __raw_spin_unlock_irqrestore include/linux/spinlock_api_smp.h:152 [inline]
       _raw_spin_unlock_irqrestore+0xd8/0x140 kernel/locking/spinlock.c:194
       spin_unlock_irqrestore include/linux/spinlock.h:406 [inline]
       uart_port_unlock_irqrestore include/linux/serial_core.h:667 [inline]
       serial_port_runtime_resume+0x204/0x2b0 drivers/tty/serial/serial_port.c:41
       __rpm_callback+0x2df/0x790 drivers/base/power/runtime.c:393
       rpm_callback drivers/base/power/runtime.c:447 [inline]
       rpm_resume+0x10b2/0x1af0 drivers/base/power/runtime.c:913
       pm_runtime_work+0x147/0x210 drivers/base/power/runtime.c:978
       process_one_work kernel/workqueue.c:3254 [inline]
       process_scheduled_works+0xa00/0x1770 kernel/workqueue.c:3335
       worker_thread+0x86d/0xd70 kernel/workqueue.c:3416
       kthread+0x2f0/0x390 kernel/kthread.c:388
       ret_from_fork+0x4b/0x80 arch/x86/kernel/process.c:147
       ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:243

-> #2 (&tty->write_wait){-...}-{2:2}:
       lock_acquire+0x1e4/0x530 kernel/locking/lockdep.c:5754
       __raw_spin_lock_irqsave include/linux/spinlock_api_smp.h:110 [inline]
       _raw_spin_lock_irqsave+0xd5/0x120 kernel/locking/spinlock.c:162
       __wake_up_common_lock+0x25/0x1e0 kernel/sched/wait.c:105
       tty_port_default_wakeup+0xa6/0xf0 drivers/tty/tty_port.c:69
       serial8250_tx_chars+0x6ad/0x8a0 drivers/tty/serial/8250/8250_port.c:1835
       serial8250_handle_irq+0x558/0x710 drivers/tty/serial/8250/8250_port.c:1942
       serial8250_default_handle_irq+0xd1/0x1f0 drivers/tty/serial/8250/8250_port.c:1962
       serial8250_interrupt+0xa9/0x1f0 drivers/tty/serial/8250/8250_core.c:127
       __handle_irq_event_percpu+0x28a/0xa30 kernel/irq/handle.c:158
       handle_irq_event_percpu kernel/irq/handle.c:193 [inline]
       handle_irq_event+0x89/0x1f0 kernel/irq/handle.c:210
       handle_edge_irq+0x25f/0xc20 kernel/irq/chip.c:831
       generic_handle_irq_desc include/linux/irqdesc.h:161 [inline]
       handle_irq arch/x86/kernel/irq.c:238 [inline]
       __common_interrupt+0x138/0x230 arch/x86/kernel/irq.c:257
       common_interrupt+0xa5/0xd0 arch/x86/kernel/irq.c:247
       asm_common_interrupt+0x26/0x40 arch/x86/include/asm/idtentry.h:693
       __raw_spin_unlock_irqrestore include/linux/spinlock_api_smp.h:152 [inline]
       _raw_spin_unlock_irqrestore+0xd8/0x140 kernel/locking/spinlock.c:194
       spin_unlock_irqrestore include/linux/spinlock.h:406 [inline]
       uart_port_unlock_irqrestore include/linux/serial_core.h:667 [inline]
       serial_port_runtime_resume+0x204/0x2b0 drivers/tty/serial/serial_port.c:41
       __rpm_callback+0x2df/0x790 drivers/base/power/runtime.c:393
       rpm_callback drivers/base/power/runtime.c:447 [inline]
       rpm_resume+0x10b2/0x1af0 drivers/base/power/runtime.c:913
       pm_runtime_work+0x147/0x210 drivers/base/power/runtime.c:978
       process_one_work kernel/workqueue.c:3254 [inline]
       process_scheduled_works+0xa00/0x1770 kernel/workqueue.c:3335
       worker_thread+0x86d/0xd70 kernel/workqueue.c:3416
       kthread+0x2f0/0x390 kernel/kthread.c:388
       ret_from_fork+0x4b/0x80 arch/x86/kernel/process.c:147
       ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:243

-> #1 (&port_lock_key){-...}-{2:2}:
       lock_acquire+0x1e4/0x530 kernel/locking/lockdep.c:5754
       __raw_spin_lock_irqsave include/linux/spinlock_api_smp.h:110 [inline]
       _raw_spin_lock_irqsave+0xd5/0x120 kernel/locking/spinlock.c:162
       uart_port_lock_irqsave include/linux/serial_core.h:616 [inline]
       serial8250_console_write+0x1a8/0x1840 drivers/tty/serial/8250/8250_port.c:3403
       console_emit_next_record kernel/printk/printk.c:2890 [inline]
       console_flush_all+0x80b/0xec0 kernel/printk/printk.c:2956
       console_unlock+0x13b/0x4d0 kernel/printk/printk.c:3025
       vprintk_emit+0x509/0x720 kernel/printk/printk.c:2292
       _printk+0xd5/0x120 kernel/printk/printk.c:2317
       register_console+0x70a/0xcd0 kernel/printk/printk.c:3531
       univ8250_console_init+0x49/0x50 drivers/tty/serial/8250/8250_core.c:717
       console_init+0x198/0x680 kernel/printk/printk.c:3677
       start_kernel+0x2d3/0x500 init/main.c:1012
       x86_64_start_reservations+0x2a/0x30 arch/x86/kernel/head64.c:509
       x86_64_start_kernel+0x99/0xa0 arch/x86/kernel/head64.c:490
       common_startup_64+0x13e/0x147

-> #0 (console_owner){-...}-{0:0}:
       check_prev_add kernel/locking/lockdep.c:3134 [inline]
       check_prevs_add kernel/locking/lockdep.c:3253 [inline]
       validate_chain+0x18cb/0x58e0 kernel/locking/lockdep.c:3869
       __lock_acquire+0x1346/0x1fd0 kernel/locking/lockdep.c:5137
       lock_acquire+0x1e4/0x530 kernel/locking/lockdep.c:5754
       console_lock_spinning_enable kernel/printk/printk.c:1843 [inline]
       console_emit_next_record kernel/printk/printk.c:2884 [inline]
       console_flush_all+0x7ba/0xec0 kernel/printk/printk.c:2956
       console_unlock+0x13b/0x4d0 kernel/printk/printk.c:3025
       vprintk_emit+0x509/0x720 kernel/printk/printk.c:2292
       _printk+0xd5/0x120 kernel/printk/printk.c:2317
       fail_dump lib/fault-inject.c:45 [inline]
       should_fail_ex+0x391/0x4e0 lib/fault-inject.c:153
       strncpy_from_user+0x36/0x2f0 lib/strncpy_from_user.c:118
       strncpy_from_user_nofault+0x71/0x140 mm/maccess.c:186
       bpf_probe_read_user_str_common kernel/trace/bpf_trace.c:216 [inline]
       ____bpf_probe_read_compat_str kernel/trace/bpf_trace.c:311 [inline]
       bpf_probe_read_compat_str+0xe9/0x180 kernel/trace/bpf_trace.c:307
       bpf_prog_1b1fa9c7e3e0101d+0x42/0x44
       bpf_dispatcher_nop_func include/linux/bpf.h:1234 [inline]
       __bpf_prog_run include/linux/filter.h:657 [inline]
       bpf_prog_run include/linux/filter.h:664 [inline]
       __bpf_trace_run kernel/trace/bpf_trace.c:2381 [inline]
       bpf_trace_run2+0x204/0x420 kernel/trace/bpf_trace.c:2420
       trace_tlb_flush+0xfa/0x120 include/trace/events/tlb.h:38
       switch_mm_irqs_off+0x7cb/0xae0
       context_switch kernel/sched/core.c:5393 [inline]
       __schedule+0x1054/0x4a20 kernel/sched/core.c:6736
       preempt_schedule_common+0x84/0xd0 kernel/sched/core.c:6915
       preempt_schedule+0xe1/0xf0 kernel/sched/core.c:6939
       preempt_schedule_thunk+0x1a/0x30 arch/x86/entry/thunk_64.S:12
       unwind_next_frame+0x2124/0x2a00 arch/x86/kernel/unwind_orc.c:672
       arch_stack_walk+0x151/0x1b0 arch/x86/kernel/stacktrace.c:25
       stack_trace_save+0x118/0x1d0 kernel/stacktrace.c:122
       kasan_save_stack mm/kasan/common.c:47 [inline]
       kasan_save_track+0x3f/0x80 mm/kasan/common.c:68
       unpoison_slab_object mm/kasan/common.c:312 [inline]
       __kasan_slab_alloc+0x66/0x80 mm/kasan/common.c:338
       kasan_slab_alloc include/linux/kasan.h:201 [inline]
       slab_post_alloc_hook mm/slub.c:3813 [inline]
       slab_alloc_node mm/slub.c:3860 [inline]
       kmem_cache_alloc+0x172/0x350 mm/slub.c:3867
       mempool_alloc+0x197/0x5a0 mm/mempool.c:408
       bio_alloc_bioset+0x26f/0x1130 block/bio.c:543
       iomap_dio_zero+0x150/0x520 fs/iomap/direct-io.c:242
       iomap_dio_bio_iter+0x87a/0x1670 fs/iomap/direct-io.c:360
       __iomap_dio_rw+0x1271/0x2320 fs/iomap/direct-io.c:660
       iomap_dio_rw+0x46/0xa0 fs/iomap/direct-io.c:749
       ext4_dio_write_iter fs/ext4/file.c:577 [inline]
       ext4_file_write_iter+0x15e5/0x1a10 fs/ext4/file.c:696
       call_write_iter include/linux/fs.h:2108 [inline]
       new_sync_write fs/read_write.c:497 [inline]
       vfs_write+0xa84/0xcb0 fs/read_write.c:590
       ksys_write+0x1a0/0x2c0 fs/read_write.c:643
       do_syscall_64+0xfb/0x240
       entry_SYSCALL_64_after_hwframe+0x6d/0x75

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 ***

7 locks held by syz-executor.2/11532:
 #0: ffff88802c66e848 (&f->f_pos_lock){+.+.}-{3:3}, at: __fdget_pos+0x259/0x320 fs/file.c:1191
 #1: ffff88801dc76420 (sb_writers#4){.+.+}-{0:0}, at: file_start_write include/linux/fs.h:2853 [inline]
 #1: ffff88801dc76420 (sb_writers#4){.+.+}-{0:0}, at: vfs_write+0x233/0xcb0 fs/read_write.c:586
 #2: ffff88806b475400 (&sb->s_type->i_mutex_key#8){++++}-{3:3}, at: inode_lock include/linux/fs.h:793 [inline]
 #2: ffff88806b475400 (&sb->s_type->i_mutex_key#8){++++}-{3:3}, at: ext4_dio_write_iter fs/ext4/file.c:530 [inline]
 #2: ffff88806b475400 (&sb->s_type->i_mutex_key#8){++++}-{3:3}, at: ext4_file_write_iter+0x388/0x1a10 fs/ext4/file.c:696
 #3: ffff8880b943e158 (&rq->__lock){-.-.}-{2:2}, at: raw_spin_rq_lock_nested+0x2a/0x140 kernel/sched/core.c:559
 #4: ffffffff8e131920 (rcu_read_lock){....}-{1:2}, at: rcu_lock_acquire include/linux/rcupdate.h:298 [inline]
 #4: ffffffff8e131920 (rcu_read_lock){....}-{1:2}, at: rcu_read_lock include/linux/rcupdate.h:750 [inline]
 #4: ffffffff8e131920 (rcu_read_lock){....}-{1:2}, at: __bpf_trace_run kernel/trace/bpf_trace.c:2380 [inline]
 #4: ffffffff8e131920 (rcu_read_lock){....}-{1:2}, at: bpf_trace_run2+0x114/0x420 kernel/trace/bpf_trace.c:2420
 #5: ffffffff8e00d500 (console_lock){+.+.}-{0:0}, at: _printk+0xd5/0x120 kernel/printk/printk.c:2317
 #6: ffffffff8e00d130 (console_srcu){....}-{0:0}, at: rcu_try_lock_acquire include/linux/rcupdate.h:303 [inline]
 #6: ffffffff8e00d130 (console_srcu){....}-{0:0}, at: srcu_read_lock_nmisafe include/linux/srcu.h:232 [inline]
 #6: ffffffff8e00d130 (console_srcu){....}-{0:0}, at: console_srcu_read_lock kernel/printk/printk.c:286 [inline]
 #6: ffffffff8e00d130 (console_srcu){....}-{0:0}, at: console_flush_all+0x14a/0xec0 kernel/printk/printk.c:2948

stack backtrace:
CPU: 0 PID: 11532 Comm: syz-executor.2 Not tainted 6.8.0-syzkaller-05236-g443574b03387 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 03/27/2024
Call Trace:
 <TASK>
 __dump_stack lib/dump_stack.c:88 [inline]
 dump_stack_lvl+0x1e7/0x2e0 lib/dump_stack.c:106
 check_noncircular+0x36a/0x4a0 kernel/locking/lockdep.c:2187
 check_prev_add kernel/locking/lockdep.c:3134 [inline]
 check_prevs_add kernel/locking/lockdep.c:3253 [inline]
 validate_chain+0x18cb/0x58e0 kernel/locking/lockdep.c:3869
 __lock_acquire+0x1346/0x1fd0 kernel/locking/lockdep.c:5137
 lock_acquire+0x1e4/0x530 kernel/locking/lockdep.c:5754
 console_lock_spinning_enable kernel/printk/printk.c:1843 [inline]
 console_emit_next_record kernel/printk/printk.c:2884 [inline]
 console_flush_all+0x7ba/0xec0 kernel/printk/printk.c:2956
 console_unlock+0x13b/0x4d0 kernel/printk/printk.c:3025
 vprintk_emit+0x509/0x720 kernel/printk/printk.c:2292
 _printk+0xd5/0x120 kernel/printk/printk.c:2317
 fail_dump lib/fault-inject.c:45 [inline]
 should_fail_ex+0x391/0x4e0 lib/fault-inject.c:153
 strncpy_from_user+0x36/0x2f0 lib/strncpy_from_user.c:118
 strncpy_from_user_nofault+0x71/0x140 mm/maccess.c:186
 bpf_probe_read_user_str_common kernel/trace/bpf_trace.c:216 [inline]
 ____bpf_probe_read_compat_str kernel/trace/bpf_trace.c:311 [inline]
 bpf_probe_read_compat_str+0xe9/0x180 kernel/trace/bpf_trace.c:307
 bpf_prog_1b1fa9c7e3e0101d+0x42/0x44
 bpf_dispatcher_nop_func include/linux/bpf.h:1234 [inline]
 __bpf_prog_run include/linux/filter.h:657 [inline]
 bpf_prog_run include/linux/filter.h:664 [inline]
 __bpf_trace_run kernel/trace/bpf_trace.c:2381 [inline]
 bpf_trace_run2+0x204/0x420 kernel/trace/bpf_trace.c:2420
 trace_tlb_flush+0xfa/0x120 include/trace/events/tlb.h:38
 switch_mm_irqs_off+0x7cb/0xae0
 context_switch kernel/sched/core.c:5393 [inline]
 __schedule+0x1054/0x4a20 kernel/sched/core.c:6736
 preempt_schedule_common+0x84/0xd0 kernel/sched/core.c:6915
 preempt_schedule+0xe1/0xf0 kernel/sched/core.c:6939
 preempt_schedule_thunk+0x1a/0x30 arch/x86/entry/thunk_64.S:12
 unwind_next_frame+0x2124/0x2a00 arch/x86/kernel/unwind_orc.c:672
 arch_stack_walk+0x151/0x1b0 arch/x86/kernel/stacktrace.c:25
 stack_trace_save+0x118/0x1d0 kernel/stacktrace.c:122
 kasan_save_stack mm/kasan/common.c:47 [inline]
 kasan_save_track+0x3f/0x80 mm/kasan/common.c:68
 unpoison_slab_object mm/kasan/common.c:312 [inline]
 __kasan_slab_alloc+0x66/0x80 mm/kasan/common.c:338
 kasan_slab_alloc include/linux/kasan.h:201 [inline]
 slab_post_alloc_hook mm/slub.c:3813 [inline]
 slab_alloc_node mm/slub.c:3860 [inline]
 kmem_cache_alloc+0x172/0x350 mm/slub.c:3867
 mempool_alloc+0x197/0x5a0 mm/mempool.c:408
 bio_alloc_bioset+0x26f/0x1130 block/bio.c:543
 iomap_dio_zero+0x150/0x520 fs/iomap/direct-io.c:242
 iomap_dio_bio_iter+0x87a/0x1670 fs/iomap/direct-io.c:360
 __iomap_dio_rw+0x1271/0x2320 fs/iomap/direct-io.c:660
 iomap_dio_rw+0x46/0xa0 fs/iomap/direct-io.c:749
 ext4_dio_write_iter fs/ext4/file.c:577 [inline]
 ext4_file_write_iter+0x15e5/0x1a10 fs/ext4/file.c:696
 call_write_iter include/linux/fs.h:2108 [inline]
 new_sync_write fs/read_write.c:497 [inline]
 vfs_write+0xa84/0xcb0 fs/read_write.c:590
 ksys_write+0x1a0/0x2c0 fs/read_write.c:643
 do_syscall_64+0xfb/0x240
 entry_SYSCALL_64_after_hwframe+0x6d/0x75
RIP: 0033:0x7f1e8fa7dea9
Code: Unable to access opcode bytes at 0x7f1e8fa7de7f.
RSP: 002b:00007f1e9078d0c8 EFLAGS: 00000246 ORIG_RAX: 0000000000000001
RAX: ffffffffffffffda RBX: 00007f1e8fbabf80 RCX: 00007f1e8fa7dea9
RDX: 0000000000248800 RSI: 0000000020000000 RDI: 0000000000000004
RBP: 00007f1e9078d120 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000002
R13: 000000000000000b R14: 00007f1e8fbabf80 R15: 00007ffd83b56ad8
 </TASK>
CPU: 0 PID: 11532 Comm: syz-executor.2 Not tainted 6.8.0-syzkaller-05236-g443574b03387 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 03/27/2024
Call Trace:
 <TASK>
 __dump_stack lib/dump_stack.c:88 [inline]
 dump_stack_lvl+0x1e7/0x2e0 lib/dump_stack.c:106
 fail_dump lib/fault-inject.c:52 [inline]
 should_fail_ex+0x3b0/0x4e0 lib/fault-inject.c:153
 strncpy_from_user+0x36/0x2f0 lib/strncpy_from_user.c:118
 strncpy_from_user_nofault+0x71/0x140 mm/maccess.c:186
 bpf_probe_read_user_str_common kernel/trace/bpf_trace.c:216 [inline]
 ____bpf_probe_read_compat_str kernel/trace/bpf_trace.c:311 [inline]
 bpf_probe_read_compat_str+0xe9/0x180 kernel/trace/bpf_trace.c:307
 bpf_prog_1b1fa9c7e3e0101d+0x42/0x44
 bpf_dispatcher_nop_func include/linux/bpf.h:1234 [inline]
 __bpf_prog_run include/linux/filter.h:657 [inline]
 bpf_prog_run include/linux/filter.h:664 [inline]
 __bpf_trace_run kernel/trace/bpf_trace.c:2381 [inline]
 bpf_trace_run2+0x204/0x420 kernel/trace/bpf_trace.c:2420
 trace_tlb_flush+0xfa/0x120 include/trace/events/tlb.h:38
 switch_mm_irqs_off+0x7cb/0xae0
 context_switch kernel/sched/core.c:5393 [inline]
 __schedule+0x1054/0x4a20 kernel/sched/core.c:6736
 preempt_schedule_common+0x84/0xd0 kernel/sched/core.c:6915
 preempt_schedule+0xe1/0xf0 kernel/sched/core.c:6939
 preempt_schedule_thunk+0x1a/0x30 arch/x86/entry/thunk_64.S:12
 unwind_next_frame+0x2124/0x2a00 arch/x86/kernel/unwind_orc.c:672
 arch_stack_walk+0x151/0x1b0 arch/x86/kernel/stacktrace.c:25
 stack_trace_save+0x118/0x1d0 kernel/stacktrace.c:122
 kasan_save_stack mm/kasan/common.c:47 [inline]
 kasan_save_track+0x3f/0x80 mm/kasan/common.c:68
 unpoison_slab_object mm/kasan/common.c:312 [inline]
 __kasan_slab_alloc+0x66/0x80 mm/kasan/common.c:338
 kasan_slab_alloc include/linux/kasan.h:201 [inline]
 slab_post_alloc_hook mm/slub.c:3813 [inline]
 slab_alloc_node mm/slub.c:3860 [inline]
 kmem_cache_alloc+0x172/0x350 mm/slub.c:3867
 mempool_alloc+0x197/0x5a0 mm/mempool.c:408
 bio_alloc_bioset+0x26f/0x1130 block/bio.c:543
 iomap_dio_zero+0x150/0x520 fs/iomap/direct-io.c:242
 iomap_dio_bio_iter+0x87a/0x1670 fs/iomap/direct-io.c:360
 __iomap_dio_rw+0x1271/0x2320 fs/iomap/direct-io.c:660
 iomap_dio_rw+0x46/0xa0 fs/iomap/direct-io.c:749
 ext4_dio_write_iter fs/ext4/file.c:577 [inline]
 ext4_file_write_iter+0x15e5/0x1a10 fs/ext4/file.c:696
 call_write_iter include/linux/fs.h:2108 [inline]
 new_sync_write fs/read_write.c:497 [inline]
 vfs_write+0xa84/0xcb0 fs/read_write.c:590
 ksys_write+0x1a0/0x2c0 fs/read_write.c:643
 do_syscall_64+0xfb/0x240
 entry_SYSCALL_64_after_hwframe+0x6d/0x75
RIP: 0033:0x7f1e8fa7dea9
Code: Unable to access opcode bytes at 0x7f1e8fa7de7f.
RSP: 002b:00007f1e9078d0c8 EFLAGS: 00000246 ORIG_RAX: 0000000000000001
RAX: ffffffffffffffda RBX: 00007f1e8fbabf80 RCX: 00007f1e8fa7dea9
RDX: 0000000000248800 RSI: 0000000020000000 RDI: 0000000000000004
RBP: 00007f1e9078d120 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000002
R13: 000000000000000b R14: 00007f1e8fbabf80 R15: 00007ffd83b56ad8
 </TASK>