kasan: CONFIG_KASAN_INLINE enabled kasan: GPF could be caused by NULL-ptr deref or user memory access general protection fault: 0000 [#1] SMP KASAN Dumping ftrace buffer: (ftrace buffer empty) Modules linked in: CPU: 0 PID: 4516 Comm: syz-executor2 Not tainted 4.16.0+ #4 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 RIP: 0010:__delayacct_blkio_end+0x4f/0xc0 kernel/delayacct.c:82 RSP: 0018:ffff8801db006888 EFLAGS: 00010002 RAX: dffffc0000000000 RBX: 0000000000000000 RCX: ffff8801d7a3c2b8 RDX: 0000000000000007 RSI: ffffffff81783391 RDI: 0000000000000038 RBP: ffff8801db0068a0 R08: ffffed003b6046c3 R09: 0000000000000000 R10: ffff8801db006930 R11: ffff8801db023613 R12: ffff8801a2612740 R13: ffff8801d7a3c280 R14: ffff8801d7a3c2bc R15: 0000000000000002 FS: 0000000001f7d940(0000) GS:ffff8801db000000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000000000727db4 CR3: 00000001a2446000 CR4: 00000000001406f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000600 Call Trace: delayacct_blkio_end include/linux/delayacct.h:128 [inline] try_to_wake_up+0xa89/0x1190 kernel/sched/core.c:2034 default_wake_function+0x30/0x50 kernel/sched/core.c:3743 autoremove_wake_function+0x7a/0x350 kernel/sched/wait.c:373 wake_page_function+0x15f/0x1c0 mm/filemap.c:1010 __wake_up_common+0x189/0x730 kernel/sched/wait.c:90 __wake_up_locked_key_bookmark+0x16/0x20 kernel/sched/wait.c:165 wake_up_page_bit+0x297/0x580 mm/filemap.c:1030 wake_up_page mm/filemap.c:1071 [inline] end_page_writeback+0x24c/0x320 mm/filemap.c:1233 ext4_finish_bio+0x593/0x940 fs/ext4/page-io.c:118 ext4_end_bio+0x18f/0x6d0 fs/ext4/page-io.c:342 bio_endio+0x4b8/0x920 block/bio.c:1775 req_bio_endio block/blk-core.c:280 [inline] blk_update_request+0x3a3/0xcb0 block/blk-core.c:3076 scsi_end_request+0xd3/0x870 drivers/scsi/scsi_lib.c:672 scsi_io_completion+0xca9/0x1d10 drivers/scsi/scsi_lib.c:891 scsi_finish_command+0x542/0x8d0 drivers/scsi/scsi.c:248 scsi_softirq_done+0x3d9/0x4b0 drivers/scsi/scsi_lib.c:1676 __blk_mq_complete_request+0x4c8/0x9f0 block/blk-mq.c:551 blk_mq_complete_request+0x2a5/0x370 block/blk-mq.c:636 scsi_mq_done+0xe2/0x430 drivers/scsi/scsi_lib.c:1987 virtscsi_complete_cmd+0x573/0x740 drivers/scsi/virtio_scsi.c:207 virtscsi_vq_done+0xc3/0x170 drivers/scsi/virtio_scsi.c:223 virtscsi_req_done+0xa7/0xd0 drivers/scsi/virtio_scsi.c:238 vring_interrupt+0x128/0x170 drivers/virtio/virtio_ring.c:950 __handle_irq_event_percpu+0x1c0/0xad0 kernel/irq/handle.c:149 handle_irq_event_percpu+0x98/0x1c0 kernel/irq/handle.c:189 handle_irq_event+0xa7/0x135 kernel/irq/handle.c:206 handle_edge_irq+0x20f/0x870 kernel/irq/chip.c:791 generic_handle_irq_desc include/linux/irqdesc.h:159 [inline] handle_irq+0x18c/0x2e7 arch/x86/kernel/irq_64.c:77 do_IRQ+0x78/0x190 arch/x86/kernel/irq.c:245 common_interrupt+0xf/0xf arch/x86/entry/entry_64.S:641 RIP: 0010:arch_local_irq_restore arch/x86/include/asm/paravirt.h:783 [inline] RIP: 0010:seqcount_lockdep_reader_access include/linux/seqlock.h:83 [inline] RIP: 0010:read_seqcount_begin include/linux/seqlock.h:164 [inline] RIP: 0010:ktime_get_ts64+0x432/0x510 kernel/time/timekeeping.c:850 RSP: 0018:ffff8801a263fc48 EFLAGS: 00000293 ORIG_RAX: ffffffffffffffda RAX: ffff8801a2612740 RBX: 0000000000000293 RCX: 0000000000000000 RDX: 0000000000000000 RSI: ffffffff8167009d RDI: 0000000000000293 RBP: ffff8801a263fd50 R08: ffff8801a2612740 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000000 R12: dffffc0000000000 R13: 0000000000000200 R14: ffffffff88b18760 R15: ffff8801a263fd98 posix_ktime_get_ts+0x15/0x20 kernel/time/posix-timers.c:222 SYSC_clock_gettime kernel/time/posix-timers.c:1068 [inline] SyS_clock_gettime+0x10f/0x1f0 kernel/time/posix-timers.c:1058 do_syscall_64+0x29e/0x9d0 arch/x86/entry/common.c:287 entry_SYSCALL_64_after_hwframe+0x42/0xb7 RIP: 0033:0x45814a RSP: 002b:00007ffffdf58808 EFLAGS: 00000246 ORIG_RAX: 00000000000000e4 RAX: ffffffffffffffda RBX: 0000000000000b5a RCX: 000000000045814a RDX: 0000000000000000 RSI: 00007ffffdf58810 RDI: 0000000000000001 RBP: 00000000000e2826 R08: 0000000000000001 R09: 0000000001f7d940 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 0000000000000000 R14: 0000000000001879 R15: 00000000000e2826 Code: fa 48 c1 ea 03 80 3c 02 00 0f 85 80 00 00 00 48 8b 9b 30 12 00 00 48 b8 00 00 00 00 00 fc ff df 48 8d 7b 38 48 89 fa 48 c1 ea 03 <0f> b6 04 02 84 c0 74 04 3c 03 7e 51 44 8b 63 38 31 ff 41 83 e4 RIP: __delayacct_blkio_end+0x4f/0xc0 kernel/delayacct.c:82 RSP: ffff8801db006888 ====================================================== WARNING: possible circular locking dependency detected 4.16.0+ #4 Not tainted ------------------------------------------------------ syz-executor2/4516 is trying to acquire lock: 000000009bd89435 ((console_sem).lock){-.-.}, at: down_trylock+0x13/0x70 kernel/locking/semaphore.c:136 but task is already holding lock: 0000000036c38389 (&p->pi_lock){-.-.}, at: try_to_wake_up+0xca/0x1190 kernel/sched/core.c:1963 which lock already depends on the new lock. the existing dependency chain (in reverse order) is: -> #1 (&p->pi_lock){-.-.}: __raw_spin_lock_irqsave include/linux/spinlock_api_smp.h:110 [inline] _raw_spin_lock_irqsave+0x96/0xc0 kernel/locking/spinlock.c:152 try_to_wake_up+0xca/0x1190 kernel/sched/core.c:1963 wake_up_process+0x10/0x20 kernel/sched/core.c:2126 __up.isra.1+0x1b8/0x290 kernel/locking/semaphore.c:262 up+0x12f/0x1b0 kernel/locking/semaphore.c:187 __up_console_sem+0xbe/0x1b0 kernel/printk/printk.c:242 console_unlock+0x7d6/0x1100 kernel/printk/printk.c:2417 con_install+0x34e/0x420 drivers/tty/vt/vt.c:2908 tty_driver_install_tty drivers/tty/tty_io.c:1224 [inline] tty_init_dev+0xfd/0x460 drivers/tty/tty_io.c:1324 tty_open_by_driver drivers/tty/tty_io.c:1959 [inline] tty_open+0x67d/0xb10 drivers/tty/tty_io.c:2007 chrdev_open+0x256/0x760 fs/char_dev.c:417 do_dentry_open+0x7ef/0xf10 fs/open.c:784 vfs_open+0x139/0x230 fs/open.c:906 do_last fs/namei.c:3365 [inline] path_openat+0x1676/0x4e20 fs/namei.c:3501 do_filp_open+0x249/0x350 fs/namei.c:3535 do_sys_open+0x56f/0x740 fs/open.c:1093 SYSC_open fs/open.c:1111 [inline] SyS_open+0x2d/0x40 fs/open.c:1106 do_syscall_64+0x29e/0x9d0 arch/x86/entry/common.c:287 entry_SYSCALL_64_after_hwframe+0x42/0xb7 -> #0 ((console_sem).lock){-.-.}: lock_acquire+0x1dc/0x520 kernel/locking/lockdep.c:3920 __raw_spin_lock_irqsave include/linux/spinlock_api_smp.h:110 [inline] _raw_spin_lock_irqsave+0x96/0xc0 kernel/locking/spinlock.c:152 down_trylock+0x13/0x70 kernel/locking/semaphore.c:136 __down_trylock_console_sem+0xae/0x200 kernel/printk/printk.c:225 console_trylock+0x15/0xa0 kernel/printk/printk.c:2229 console_trylock_spinning kernel/printk/printk.c:1643 [inline] vprintk_emit+0x694/0xdd0 kernel/printk/printk.c:1906 vprintk_default+0x28/0x30 kernel/printk/printk.c:1947 vprintk_func+0x7a/0xe7 kernel/printk/printk_safe.c:379 printk+0x9e/0xba kernel/printk/printk.c:1980 kasan_die_handler.cold.22+0x11/0x30 arch/x86/mm/kasan_init_64.c:253 notifier_call_chain+0x178/0x380 kernel/notifier.c:93 __atomic_notifier_call_chain kernel/notifier.c:183 [inline] atomic_notifier_call_chain+0x98/0x190 kernel/notifier.c:193 notify_die+0x1a3/0x2b0 kernel/notifier.c:549 do_general_protection+0x248/0x2f0 arch/x86/kernel/traps.c:558 general_protection+0x25/0x50 arch/x86/entry/entry_64.S:1158 __delayacct_blkio_end+0x4f/0xc0 kernel/delayacct.c:82 delayacct_blkio_end include/linux/delayacct.h:128 [inline] try_to_wake_up+0xa89/0x1190 kernel/sched/core.c:2034 default_wake_function+0x30/0x50 kernel/sched/core.c:3743 autoremove_wake_function+0x7a/0x350 kernel/sched/wait.c:373 wake_page_function+0x15f/0x1c0 mm/filemap.c:1010 __wake_up_common+0x189/0x730 kernel/sched/wait.c:90 __wake_up_locked_key_bookmark+0x16/0x20 kernel/sched/wait.c:165 wake_up_page_bit+0x297/0x580 mm/filemap.c:1030 wake_up_page mm/filemap.c:1071 [inline] end_page_writeback+0x24c/0x320 mm/filemap.c:1233 ext4_finish_bio+0x593/0x940 fs/ext4/page-io.c:118 ext4_end_bio+0x18f/0x6d0 fs/ext4/page-io.c:342 bio_endio+0x4b8/0x920 block/bio.c:1775 req_bio_endio block/blk-core.c:280 [inline] blk_update_request+0x3a3/0xcb0 block/blk-core.c:3076 scsi_end_request+0xd3/0x870 drivers/scsi/scsi_lib.c:672 scsi_io_completion+0xca9/0x1d10 drivers/scsi/scsi_lib.c:891 scsi_finish_command+0x542/0x8d0 drivers/scsi/scsi.c:248 scsi_softirq_done+0x3d9/0x4b0 drivers/scsi/scsi_lib.c:1676 __blk_mq_complete_request+0x4c8/0x9f0 block/blk-mq.c:551 blk_mq_complete_request+0x2a5/0x370 block/blk-mq.c:636 scsi_mq_done+0xe2/0x430 drivers/scsi/scsi_lib.c:1987 virtscsi_complete_cmd+0x573/0x740 drivers/scsi/virtio_scsi.c:207 virtscsi_vq_done+0xc3/0x170 drivers/scsi/virtio_scsi.c:223 virtscsi_req_done+0xa7/0xd0 drivers/scsi/virtio_scsi.c:238 vring_interrupt+0x128/0x170 drivers/virtio/virtio_ring.c:950 __handle_irq_event_percpu+0x1c0/0xad0 kernel/irq/handle.c:149 handle_irq_event_percpu+0x98/0x1c0 kernel/irq/handle.c:189 handle_irq_event+0xa7/0x135 kernel/irq/handle.c:206 handle_edge_irq+0x20f/0x870 kernel/irq/chip.c:791 generic_handle_irq_desc include/linux/irqdesc.h:159 [inline] handle_irq+0x18c/0x2e7 arch/x86/kernel/irq_64.c:77 do_IRQ+0x78/0x190 arch/x86/kernel/irq.c:245 ret_from_intr+0x0/0x1e arch_local_irq_restore arch/x86/include/asm/paravirt.h:783 [inline] seqcount_lockdep_reader_access include/linux/seqlock.h:83 [inline] read_seqcount_begin include/linux/seqlock.h:164 [inline] ktime_get_ts64+0x432/0x510 kernel/time/timekeeping.c:850 posix_ktime_get_ts+0x15/0x20 kernel/time/posix-timers.c:222 SYSC_clock_gettime kernel/time/posix-timers.c:1068 [inline] SyS_clock_gettime+0x10f/0x1f0 kernel/time/posix-timers.c:1058 do_syscall_64+0x29e/0x9d0 arch/x86/entry/common.c:287 entry_SYSCALL_64_after_hwframe+0x42/0xb7 other info that might help us debug this: Possible unsafe locking scenario: CPU0 CPU1 ---- ---- lock(&p->pi_lock); lock((console_sem).lock); lock(&p->pi_lock); lock((console_sem).lock); *** DEADLOCK *** 5 locks held by syz-executor2/4516: #0: 000000006b9ab04c (&(&virtscsi_vq->vq_lock)->rlock){-.-.}, at: virtscsi_vq_done+0x9d/0x170 drivers/scsi/virtio_scsi.c:219 #1: 0000000099685ebd (rcu_read_lock){....}, at: hctx_lock+0x7a/0x1d0 block/blk-mq.c:570 #2: 000000000b4f3b2d (&page_wait_table[i]){-.-.}, at: wake_up_page_bit+0x27d/0x580 mm/filemap.c:1029 #3: 0000000036c38389 (&p->pi_lock){-.-.}, at: try_to_wake_up+0xca/0x1190 kernel/sched/core.c:1963 #4: 0000000099685ebd (rcu_read_lock){....}, at: atomic_notifier_call_chain+0x0/0x190 include/linux/compiler.h:188 stack backtrace: CPU: 0 PID: 4516 Comm: syz-executor2 Not tainted 4.16.0+ #4 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Call Trace: __dump_stack lib/dump_stack.c:77 [inline] dump_stack+0x1b9/0x294 lib/dump_stack.c:113 print_circular_bug.isra.36.cold.54+0x1bd/0x27d kernel/locking/lockdep.c:1223 check_prev_add kernel/locking/lockdep.c:1863 [inline] check_prevs_add kernel/locking/lockdep.c:1976 [inline] validate_chain kernel/locking/lockdep.c:2417 [inline] __lock_acquire+0x343e/0x5140 kernel/locking/lockdep.c:3431 lock_acquire+0x1dc/0x520 kernel/locking/lockdep.c:3920 __raw_spin_lock_irqsave include/linux/spinlock_api_smp.h:110 [inline] _raw_spin_lock_irqsave+0x96/0xc0 kernel/locking/spinlock.c:152 down_trylock+0x13/0x70 kernel/locking/semaphore.c:136 __down_trylock_console_sem+0xae/0x200 kernel/printk/printk.c:225 console_trylock+0x15/0xa0 kernel/printk/printk.c:2229 console_trylock_spinning kernel/printk/printk.c:1643 [inline] vprintk_emit+0x694/0xdd0 kernel/printk/printk.c:1906 vprintk_default+0x28/0x30 kernel/printk/printk.c:1947 vprintk_func+0x7a/0xe7 kernel/printk/printk_safe.c:379 printk+0x9e/0xba kernel/printk/printk.c:1980 kasan_die_handler.cold.22+0x11/0x30 arch/x86/mm/kasan_init_64.c:253 notifier_call_chain+0x178/0x380 kernel/notifier.c:93 __atomic_notifier_call_chain kernel/notifier.c:183 [inline] atomic_notifier_call_chain+0x98/0x190 kernel/notifier.c:193 notify_die+0x1a3/0x2b0 kernel/notifier.c:549 do_general_protection+0x248/0x2f0 arch/x86/kernel/traps.c:558 general_protection+0x25/0x50 arch/x86/entry/entry_64.S:1158 RIP: 0010:__delayacct_blkio_end+0x4f/0xc0 kernel/delayacct.c:82 RSP: 0018:ffff8801db006888 EFLAGS: 00010002 RAX: dffffc0000000000 RBX: 0000000000000000 RCX: ffff8801d7a3c2b8 RDX: 0000000000000007 RSI: ffffffff81783391 RDI: 0000000000000038 RBP: ffff8801db0068a0 R08: ffffed003b6046c3 R09: 0000000000000000 R10: ffff8801db006930 R11: ffff8801db023613 R12: ffff8801a2612740 R13: ffff8801d7a3c280 R14: ffff8801d7a3c2bc R15: 0000000000000002 delayacct_blkio_end include/linux/delayacct.h:128 [inline] try_to_wake_up+0xa89/0x1190 kernel/sched/core.c:2034 default_wake_function+0x30/0x50 kernel/sched/core.c:3743 autoremove_wake_function+0x7a/0x350 kernel/sched/wait.c:373 wake_page_function+0x15f/0x1c0 mm/filemap.c:1010 __wake_up_common+0x189/0x730 kernel/sched/wait.c:90 __wake_up_locked_key_bookmark+0x16/0x20 kernel/sched/wait.c:165 wake_up_page_bit+0x297/0x580 mm/filemap.c:1030 wake_up_page mm/filemap.c:1071 [inline] end_page_writeback+0x24c/0x320 mm/filemap.c:1233 ext4_finish_bio+0x593/0x940 fs/ext4/page-io.c:118 ext4_end_bio+0x18f/0x6d0 fs/ext4/page-io.c:342 bio_endio+0x4b8/0x920 block/bio.c:1775 Lost 110 message(s)! ---[ end trace 90c569c25d941e6f ]---