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: 22432 Comm: syz-executor0 Not tainted 4.16.0-rc7+ #8 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 RIP: 0010:__delayacct_blkio_end+0x4b/0xb0 kernel/delayacct.c:82 RSP: 0018:ffff8801db006ac8 EFLAGS: 00010002 RAX: dffffc0000000000 RBX: 0000000000000000 RCX: ffffffff81725ab1 RDX: 0000000000000007 RSI: 0000000000000004 RDI: 0000000000000038 RBP: ffff8801db006ae0 R08: 1ffff1003b600c9b R09: ffff8801bcbc6124 R10: 0000000000000001 R11: ffff8801db006b70 R12: ffff8801db006cb0 R13: ffff8801bcbc6878 R14: ffff8801bcbc60c0 R15: ffff8801bcbc654c FS: 00007f3135074700(0000) GS:ffff8801db000000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000001b9bc21000 CR3: 00000001c5e5f006 CR4: 00000000001606f0 DR0: 0000000020000000 DR1: 0000000020000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000600 Call Trace: delayacct_blkio_end include/linux/delayacct.h:128 [inline] try_to_wake_up+0xb7d/0x15f0 kernel/sched/core.c:2060 default_wake_function+0x30/0x50 kernel/sched/core.c:3693 autoremove_wake_function+0x78/0x350 kernel/sched/wait.c:377 wake_bit_function+0xbc/0x140 kernel/sched/wait_bit.c:33 __wake_up_common+0x18e/0x780 kernel/sched/wait.c:97 __wake_up_common_lock+0x1b4/0x310 kernel/sched/wait.c:125 __wake_up+0xe/0x10 kernel/sched/wait.c:149 __wake_up_bit+0x1a4/0x2a0 kernel/sched/wait_bit.c:124 wake_up_bit+0x3d/0x40 kernel/sched/wait_bit.c:147 journal_end_buffer_io_sync+0x82/0xc0 fs/jbd2/commit.c:44 end_bio_bh_io_sync+0xc5/0x110 fs/buffer.c:2992 bio_endio+0x447/0x950 block/bio.c:1775 req_bio_endio block/blk-core.c:208 [inline] blk_update_request+0x265/0xda0 block/blk-core.c:2990 scsi_end_request+0xc8/0x820 drivers/scsi/scsi_lib.c:660 scsi_io_completion+0x8ab/0x16b0 drivers/scsi/scsi_lib.c:868 scsi_finish_command+0x5f6/0x890 drivers/scsi/scsi.c:248 scsi_softirq_done+0x3ab/0x480 drivers/scsi/scsi_lib.c:1653 __blk_mq_complete_request+0x564/0x990 block/blk-mq.c:559 blk_mq_complete_request+0x1f6/0x320 block/blk-mq.c:644 scsi_mq_done+0xd6/0x3c0 drivers/scsi/scsi_lib.c:1964 virtscsi_complete_cmd+0x489/0x6f0 drivers/scsi/virtio_scsi.c:207 virtscsi_vq_done+0xc1/0x150 drivers/scsi/virtio_scsi.c:223 virtscsi_req_done+0xa7/0xd0 drivers/scsi/virtio_scsi.c:238 vring_interrupt+0x109/0x150 drivers/virtio/virtio_ring.c:951 __handle_irq_event_percpu+0x1ad/0x9d0 kernel/irq/handle.c:147 handle_irq_event_percpu+0x98/0x1b0 kernel/irq/handle.c:187 handle_irq_event+0xa7/0x140 kernel/irq/handle.c:204 handle_edge_irq+0x1d5/0x7c0 kernel/irq/chip.c:793 generic_handle_irq_desc include/linux/irqdesc.h:159 [inline] handle_irq+0x17a/0x300 arch/x86/kernel/irq_64.c:77 do_IRQ+0x78/0x190 arch/x86/kernel/irq.c:238 common_interrupt+0xf/0xf arch/x86/entry/entry_64.S:636 RIP: 0010:arch_local_irq_restore arch/x86/include/asm/paravirt.h:778 [inline] RIP: 0010:kmem_cache_free+0xf2/0x2a0 mm/slab.c:3745 RSP: 0018:ffff880174e1e560 EFLAGS: 00000282 ORIG_RAX: ffffffffffffffda RAX: 0000000000000007 RBX: ffff8801da5d6540 RCX: 0000000000000006 RDX: 0000000000000000 RSI: 1ffff10035ba81f5 RDI: 0000000000000282 RBP: ffff880174e1e580 R08: 1ffff1002e9c3c7a R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000000 R12: ffff88016d4882a0 R13: 0000000000000282 R14: ffffffff81bf555c R15: ffff88016d4882e8 free_buffer_head+0xdc/0x180 fs/buffer.c:3387 try_to_free_buffers+0x2dc/0x590 fs/buffer.c:3302 jbd2_journal_try_to_free_buffers+0x398/0x4b0 fs/jbd2/transaction.c:2016 ext4_releasepage+0x1b6/0x510 fs/ext4/inode.c:3392 try_to_release_page+0x24b/0x380 mm/filemap.c:3326 block_invalidatepage+0x2d5/0x3e0 fs/buffer.c:1515 ext4_invalidatepage+0x147/0x4c0 fs/ext4/inode.c:3354 ext4_da_invalidatepage+0x186/0xe00 fs/ext4/inode.c:3199 do_invalidatepage mm/truncate.c:165 [inline] truncate_cleanup_page+0x398/0x4b0 mm/truncate.c:187 truncate_inode_pages_range+0x771/0x1fe0 mm/truncate.c:367 truncate_inode_pages mm/truncate.c:478 [inline] truncate_pagecache+0x66/0x90 mm/truncate.c:801 ext4_setattr+0x17d1/0x2550 fs/ext4/inode.c:5520 notify_change+0xa71/0x1030 fs/attr.c:313 do_truncate+0x18d/0x280 fs/open.c:63 handle_truncate fs/namei.c:2969 [inline] do_last fs/namei.c:3388 [inline] path_openat+0x27b8/0x3530 fs/namei.c:3519 do_filp_open+0x25b/0x3b0 fs/namei.c:3554 do_sys_open+0x502/0x6d0 fs/open.c:1059 SYSC_open fs/open.c:1077 [inline] SyS_open fs/open.c:1072 [inline] SYSC_creat fs/open.c:1117 [inline] SyS_creat+0x27/0x30 fs/open.c:1115 do_syscall_64+0x281/0x940 arch/x86/entry/common.c:287 entry_SYSCALL_64_after_hwframe+0x42/0xb7 RIP: 0033:0x454e79 RSP: 002b:00007f3135073c68 EFLAGS: 00000246 ORIG_RAX: 0000000000000055 RAX: ffffffffffffffda RBX: 00007f31350746d4 RCX: 0000000000454e79 RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000020000040 RBP: 000000000072c0c8 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 00000000ffffffff R13: 0000000000000069 R14: 00000000006f2a78 R15: 0000000000000003 Code: ff df 48 89 fa 48 c1 ea 03 80 3c 02 00 75 6f 48 8b 9b 70 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 40 f6 43 38 01 75 2b 4c 8d 63 RIP: __delayacct_blkio_end+0x4b/0xb0 kernel/delayacct.c:82 RSP: ffff8801db006ac8 ====================================================== WARNING: possible circular locking dependency detected 4.16.0-rc7+ #8 Not tainted ------------------------------------------------------ syz-executor0/22432 is trying to acquire lock: ((console_sem).lock){-.-.}, at: [<00000000473f601f>] down_trylock+0x13/0x70 kernel/locking/semaphore.c:136 but task is already holding lock: (&p->pi_lock){-.-.}, at: [<00000000f03de2e7>] try_to_wake_up+0xbc/0x15f0 kernel/sched/core.c:1989 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+0xbc/0x15f0 kernel/sched/core.c:1989 wake_up_process+0x10/0x20 kernel/sched/core.c:2152 __up.isra.0+0x1cc/0x2c0 kernel/locking/semaphore.c:262 up+0x13b/0x1d0 kernel/locking/semaphore.c:187 __up_console_sem+0xb2/0x1a0 kernel/printk/printk.c:242 console_unlock+0x5af/0xfb0 kernel/printk/printk.c:2417 do_con_write+0x106e/0x1f70 drivers/tty/vt/vt.c:2433 con_write+0x25/0xb0 drivers/tty/vt/vt.c:2782 process_output_block drivers/tty/n_tty.c:579 [inline] n_tty_write+0x5ef/0xec0 drivers/tty/n_tty.c:2308 do_tty_write drivers/tty/tty_io.c:958 [inline] tty_write+0x3fa/0x840 drivers/tty/tty_io.c:1042 __vfs_write+0xef/0x970 fs/read_write.c:480 vfs_write+0x189/0x510 fs/read_write.c:544 SYSC_write fs/read_write.c:589 [inline] SyS_write+0xef/0x220 fs/read_write.c:581 do_syscall_64+0x281/0x940 arch/x86/entry/common.c:287 entry_SYSCALL_64_after_hwframe+0x42/0xb7 -> #0 ((console_sem).lock){-.-.}: lock_acquire+0x1d5/0x580 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+0xa2/0x1e0 kernel/printk/printk.c:225 console_trylock+0x15/0x70 kernel/printk/printk.c:2229 console_trylock_spinning kernel/printk/printk.c:1643 [inline] vprintk_emit+0x5b5/0xb90 kernel/printk/printk.c:1906 vprintk_default+0x28/0x30 kernel/printk/printk.c:1947 vprintk_func+0x57/0xc0 kernel/printk/printk_safe.c:379 printk+0xaa/0xca kernel/printk/printk.c:1980 kasan_die_handler+0x31/0x3f arch/x86/mm/kasan_init_64.c:247 notifier_call_chain+0x136/0x2c0 kernel/notifier.c:93 __atomic_notifier_call_chain kernel/notifier.c:183 [inline] atomic_notifier_call_chain+0x77/0x140 kernel/notifier.c:193 notify_die+0x18c/0x280 kernel/notifier.c:549 do_general_protection+0x331/0x3e0 arch/x86/kernel/traps.c:558 general_protection+0x25/0x50 arch/x86/entry/entry_64.S:1150 __delayacct_blkio_end+0x4b/0xb0 kernel/delayacct.c:82 delayacct_blkio_end include/linux/delayacct.h:128 [inline] try_to_wake_up+0xb7d/0x15f0 kernel/sched/core.c:2060 default_wake_function+0x30/0x50 kernel/sched/core.c:3693 autoremove_wake_function+0x78/0x350 kernel/sched/wait.c:377 wake_bit_function+0xbc/0x140 kernel/sched/wait_bit.c:33 __wake_up_common+0x18e/0x780 kernel/sched/wait.c:97 __wake_up_common_lock+0x1b4/0x310 kernel/sched/wait.c:125 __wake_up+0xe/0x10 kernel/sched/wait.c:149 __wake_up_bit+0x1a4/0x2a0 kernel/sched/wait_bit.c:124 wake_up_bit+0x3d/0x40 kernel/sched/wait_bit.c:147 journal_end_buffer_io_sync+0x82/0xc0 fs/jbd2/commit.c:44 end_bio_bh_io_sync+0xc5/0x110 fs/buffer.c:2992 bio_endio+0x447/0x950 block/bio.c:1775 req_bio_endio block/blk-core.c:208 [inline] blk_update_request+0x265/0xda0 block/blk-core.c:2990 scsi_end_request+0xc8/0x820 drivers/scsi/scsi_lib.c:660 scsi_io_completion+0x8ab/0x16b0 drivers/scsi/scsi_lib.c:868 scsi_finish_command+0x5f6/0x890 drivers/scsi/scsi.c:248 scsi_softirq_done+0x3ab/0x480 drivers/scsi/scsi_lib.c:1653 __blk_mq_complete_request+0x564/0x990 block/blk-mq.c:559 blk_mq_complete_request+0x1f6/0x320 block/blk-mq.c:644 scsi_mq_done+0xd6/0x3c0 drivers/scsi/scsi_lib.c:1964 virtscsi_complete_cmd+0x489/0x6f0 drivers/scsi/virtio_scsi.c:207 virtscsi_vq_done+0xc1/0x150 drivers/scsi/virtio_scsi.c:223 virtscsi_req_done+0xa7/0xd0 drivers/scsi/virtio_scsi.c:238 vring_interrupt+0x109/0x150 drivers/virtio/virtio_ring.c:951 __handle_irq_event_percpu+0x1ad/0x9d0 kernel/irq/handle.c:147 handle_irq_event_percpu+0x98/0x1b0 kernel/irq/handle.c:187 handle_irq_event+0xa7/0x140 kernel/irq/handle.c:204 handle_edge_irq+0x1d5/0x7c0 kernel/irq/chip.c:793 generic_handle_irq_desc include/linux/irqdesc.h:159 [inline] handle_irq+0x17a/0x300 arch/x86/kernel/irq_64.c:77 do_IRQ+0x78/0x190 arch/x86/kernel/irq.c:238 ret_from_intr+0x0/0x1e arch_local_irq_restore arch/x86/include/asm/paravirt.h:778 [inline] kmem_cache_free+0xf2/0x2a0 mm/slab.c:3745 free_buffer_head+0xdc/0x180 fs/buffer.c:3387 try_to_free_buffers+0x2dc/0x590 fs/buffer.c:3302 jbd2_journal_try_to_free_buffers+0x398/0x4b0 fs/jbd2/transaction.c:2016 ext4_releasepage+0x1b6/0x510 fs/ext4/inode.c:3392 try_to_release_page+0x24b/0x380 mm/filemap.c:3326 block_invalidatepage+0x2d5/0x3e0 fs/buffer.c:1515 ext4_invalidatepage+0x147/0x4c0 fs/ext4/inode.c:3354 ext4_da_invalidatepage+0x186/0xe00 fs/ext4/inode.c:3199 do_invalidatepage mm/truncate.c:165 [inline] truncate_cleanup_page+0x398/0x4b0 mm/truncate.c:187 truncate_inode_pages_range+0x771/0x1fe0 mm/truncate.c:367 truncate_inode_pages mm/truncate.c:478 [inline] truncate_pagecache+0x66/0x90 mm/truncate.c:801 ext4_setattr+0x17d1/0x2550 fs/ext4/inode.c:5520 notify_change+0xa71/0x1030 fs/attr.c:313 do_truncate+0x18d/0x280 fs/open.c:63 handle_truncate fs/namei.c:2969 [inline] do_last fs/namei.c:3388 [inline] path_openat+0x27b8/0x3530 fs/namei.c:3519 do_filp_open+0x25b/0x3b0 fs/namei.c:3554 do_sys_open+0x502/0x6d0 fs/open.c:1059 SYSC_open fs/open.c:1077 [inline] SyS_open fs/open.c:1072 [inline] SYSC_creat fs/open.c:1117 [inline] SyS_creat+0x27/0x30 fs/open.c:1115 do_syscall_64+0x281/0x940 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 *** 8 locks held by syz-executor0/22432: #0: (sb_writers#4){.+.+}, at: [<000000006965bd9b>] sb_start_write include/linux/fs.h:1548 [inline] #0: (sb_writers#4){.+.+}, at: [<000000006965bd9b>] mnt_want_write+0x3f/0xb0 fs/namespace.c:386 #1: (&sb->s_type->i_mutex_key#10){++++}, at: [<00000000ff6312c6>] inode_lock include/linux/fs.h:713 [inline] #1: (&sb->s_type->i_mutex_key#10){++++}, at: [<00000000ff6312c6>] do_truncate+0x180/0x280 fs/open.c:61 #2: (&ei->i_mmap_sem){++++}, at: [<00000000f4148d97>] ext4_setattr+0x17a6/0x2550 fs/ext4/inode.c:5515 #3: (&(&virtscsi_vq->vq_lock)->rlock){-.-.}, at: [<00000000706fe798>] virtscsi_vq_done+0x9d/0x150 drivers/scsi/virtio_scsi.c:219 #4: (rcu_read_lock){....}, at: [<00000000c479e1f8>] hctx_lock+0xd8/0x190 block/blk-mq.c:578 #5: (bit_wait_table + i){-.-.}, at: [<0000000088f43f13>] __wake_up_common_lock+0x190/0x310 kernel/sched/wait.c:124 #6: (&p->pi_lock){-.-.}, at: [<00000000f03de2e7>] try_to_wake_up+0xbc/0x15f0 kernel/sched/core.c:1989 #7: (rcu_read_lock){....}, at: [<000000005b26b127>] rcu_read_unlock include/linux/rcupdate.h:682 [inline] #7: (rcu_read_lock){....}, at: [<000000005b26b127>] atomic_notifier_call_chain+0x0/0x140 kernel/notifier.c:184 stack backtrace: CPU: 0 PID: 22432 Comm: syz-executor0 Not tainted 4.16.0-rc7+ #8 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Call Trace: __dump_stack lib/dump_stack.c:17 [inline] dump_stack+0x194/0x24d lib/dump_stack.c:53 print_circular_bug.isra.38+0x2cd/0x2dc 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+0x30a8/0x3e00 kernel/locking/lockdep.c:3431 lock_acquire+0x1d5/0x580 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+0xa2/0x1e0 kernel/printk/printk.c:225 console_trylock+0x15/0x70 kernel/printk/printk.c:2229 console_trylock_spinning kernel/printk/printk.c:1643 [inline] vprintk_emit+0x5b5/0xb90 kernel/printk/printk.c:1906 vprintk_default+0x28/0x30 kernel/printk/printk.c:1947 vprintk_func+0x57/0xc0 kernel/printk/printk_safe.c:379 printk+0xaa/0xca kernel/printk/printk.c:1980 kasan_die_handler+0x31/0x3f arch/x86/mm/kasan_init_64.c:247 notifier_call_chain+0x136/0x2c0 kernel/notifier.c:93 __atomic_notifier_call_chain kernel/notifier.c:183 [inline] atomic_notifier_call_chain+0x77/0x140 kernel/notifier.c:193 notify_die+0x18c/0x280 kernel/notifier.c:549 do_general_protection+0x331/0x3e0 arch/x86/kernel/traps.c:558 general_protection+0x25/0x50 arch/x86/entry/entry_64.S:1150 RIP: 0010:__delayacct_blkio_end+0x4b/0xb0 kernel/delayacct.c:82 RSP: 0018:ffff8801db006ac8 EFLAGS: 00010002 RAX: dffffc0000000000 RBX: 0000000000000000 RCX: ffffffff81725ab1 RDX: 0000000000000007 RSI: 0000000000000004 RDI: 0000000000000038 RBP: ffff8801db006ae0 R08: 1ffff1003b600c9b R09: ffff8801bcbc6124 R10: 0000000000000001 R11: ffff8801db006b70 R12: ffff8801db006cb0 R13: ffff8801bcbc6878 R14: ffff8801bcbc60c0 R15: ffff8801bcbc654c delayacct_blkio_end include/linux/delayacct.h:128 [inline] try_to_wake_up+0xb7d/0x15f0 kernel/sched/core.c:2060 default_wake_function+0x30/0x50 kernel/sched/core.c:3693 autoremove_wake_function+0x78/0x350 kernel/sched/wait.c:377 wake_bit_function+0xbc/0x140 kernel/sched/wait_bit.c:33 __wake_up_common+0x18e/0x780 kernel/sched/wait.c:97 ? common Lost 217 message(s)! ---[ end trace 915c41efdbc74ba2 ]---