R10: 0000000000000000 R11: 0000000000000296 R12: 0000000000000000 R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000 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: 24928 Comm: syz-executor3 Not tainted 4.17.0-rc7+ #102 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:ffff880164d64d58 EFLAGS: 00010002 RAX: dffffc0000000000 RBX: 0000000000000000 RCX: ffffc900028cd000 RDX: 0000000000000007 RSI: ffffffff817a4de1 RDI: 0000000000000038 RBP: ffff880164d64d70 R08: ffffed003b5c46d3 R09: 0000000000000001 R10: ffff880164d64e00 R11: ffff8801dae23693 R12: ffff8801b8f3e440 R13: ffff880190f96600 R14: ffff880190f9663c R15: 0000000000000002 FS: 0000000000000000(0000) GS:ffff8801dae00000(0063) knlGS:00000000f5f52b40 CS: 0010 DS: 002b ES: 002b CR0: 0000000080050033 CR2: 00007ffe6bcf0e9c CR3: 00000001cb83c000 CR4: 00000000001406f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: delayacct_blkio_end include/linux/delayacct.h:128 [inline] try_to_wake_up+0xa89/0x1190 kernel/sched/core.c:2037 default_wake_function+0x30/0x50 kernel/sched/core.c:3739 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 unlock_page+0x214/0x2b0 mm/filemap.c:1207 __split_huge_page+0xfc7/0x17b0 mm/huge_memory.c:2464 split_huge_page_to_list+0x15a2/0x1bf0 mm/huge_memory.c:2685 shrink_page_list+0x4a4b/0x5fe0 mm/vmscan.c:1142 shrink_inactive_list+0x73a/0x1c60 mm/vmscan.c:1784 shrink_list mm/vmscan.c:2095 [inline] shrink_node_memcg+0x78c/0x1910 mm/vmscan.c:2358 shrink_node+0x481/0x1740 mm/vmscan.c:2557 shrink_zones mm/vmscan.c:2794 [inline] do_try_to_free_pages+0x3c9/0x1240 mm/vmscan.c:2856 try_to_free_mem_cgroup_pages+0x475/0xc50 mm/vmscan.c:3146 reclaim_high.constprop.67+0x12f/0x1d0 mm/memcontrol.c:1862 mem_cgroup_handle_over_high+0x8d/0x130 mm/memcontrol.c:1887 tracehook_notify_resume include/linux/tracehook.h:193 [inline] exit_to_usermode_loop+0x274/0x310 arch/x86/entry/common.c:166 prepare_exit_to_usermode arch/x86/entry/common.c:196 [inline] syscall_return_slowpath arch/x86/entry/common.c:265 [inline] do_syscall_32_irqs_on arch/x86/entry/common.c:338 [inline] do_fast_syscall_32+0xcc3/0xf9b arch/x86/entry/common.c:394 entry_SYSENTER_compat+0x70/0x7f arch/x86/entry/entry_64_compat.S:139 RIP: 0023:0xf7f56cb9 RSP: 002b:00000000f5f520ac EFLAGS: 00000282 ORIG_RAX: 0000000000000078 RAX: 0000000000001e4f RBX: 0000000000000000 RCX: 0000000020b53000 RDX: 000000002084effc RSI: 0000000020c35ffc RDI: 0000000020b3bfff RBP: 0000000000000000 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000296 R12: 0000000000000000 R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000 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: ffff880164d64d58 ====================================================== WARNING: possible circular locking dependency detected 4.17.0-rc7+ #102 Not tainted ------------------------------------------------------ syz-executor3/24928 is trying to acquire lock: 0000000088567bb7 ((console_sem).lock){-.-.}, at: down_trylock+0x13/0x70 kernel/locking/semaphore.c:136 but task is already holding lock: 000000009d0c7cc3 (&p->pi_lock){-.-.}, at: try_to_wake_up+0xca/0x1190 kernel/sched/core.c:1966 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:1966 wake_up_process+0x10/0x20 kernel/sched/core.c:2129 __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 do_con_write+0x12b2/0x2280 drivers/tty/vt/vt.c:2437 con_write+0x25/0xc0 drivers/tty/vt/vt.c:2786 process_output_block drivers/tty/n_tty.c:579 [inline] n_tty_write+0x6b9/0x1180 drivers/tty/n_tty.c:2308 do_tty_write drivers/tty/tty_io.c:958 [inline] tty_write+0x3f1/0x880 drivers/tty/tty_io.c:1042 __vfs_write+0x10b/0x960 fs/read_write.c:485 vfs_write+0x1f8/0x560 fs/read_write.c:549 ksys_write+0xf9/0x250 fs/read_write.c:598 __do_sys_write fs/read_write.c:610 [inline] __se_sys_write fs/read_write.c:607 [inline] __x64_sys_write+0x73/0xb0 fs/read_write.c:607 do_syscall_64+0x1b1/0x800 arch/x86/entry/common.c:287 entry_SYSCALL_64_after_hwframe+0x49/0xbe -> #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+0x1e/0x30 arch/x86/entry/entry_64.S:1159 __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:2037 default_wake_function+0x30/0x50 kernel/sched/core.c:3739 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 unlock_page+0x214/0x2b0 mm/filemap.c:1207 __split_huge_page+0xfc7/0x17b0 mm/huge_memory.c:2464 split_huge_page_to_list+0x15a2/0x1bf0 mm/huge_memory.c:2685 shrink_page_list+0x4a4b/0x5fe0 mm/vmscan.c:1142 shrink_inactive_list+0x73a/0x1c60 mm/vmscan.c:1784 shrink_list mm/vmscan.c:2095 [inline] shrink_node_memcg+0x78c/0x1910 mm/vmscan.c:2358 shrink_node+0x481/0x1740 mm/vmscan.c:2557 shrink_zones mm/vmscan.c:2794 [inline] do_try_to_free_pages+0x3c9/0x1240 mm/vmscan.c:2856 try_to_free_mem_cgroup_pages+0x475/0xc50 mm/vmscan.c:3146 reclaim_high.constprop.67+0x12f/0x1d0 mm/memcontrol.c:1862 mem_cgroup_handle_over_high+0x8d/0x130 mm/memcontrol.c:1887 tracehook_notify_resume include/linux/tracehook.h:193 [inline] exit_to_usermode_loop+0x274/0x310 arch/x86/entry/common.c:166 prepare_exit_to_usermode arch/x86/entry/common.c:196 [inline] syscall_return_slowpath arch/x86/entry/common.c:265 [inline] do_syscall_32_irqs_on arch/x86/entry/common.c:338 [inline] do_fast_syscall_32+0xcc3/0xf9b arch/x86/entry/common.c:394 entry_SYSENTER_compat+0x70/0x7f arch/x86/entry/entry_64_compat.S:139 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 *** 4 locks held by syz-executor3/24928: #0: 00000000e959f8ae (&anon_vma->rwsem){++++}, at: anon_vma_lock_write include/linux/rmap.h:120 [inline] #0: 00000000e959f8ae (&anon_vma->rwsem){++++}, at: split_huge_page_to_list+0xd54/0x1bf0 mm/huge_memory.c:2624 #1: 00000000d997cd2b (&page_wait_table[i]){-.-.}, at: wake_up_page_bit+0x27d/0x580 mm/filemap.c:1029 #2: 000000009d0c7cc3 (&p->pi_lock){-.-.}, at: try_to_wake_up+0xca/0x1190 kernel/sched/core.c:1966 #3: 000000008b462473 (rcu_read_lock){....}, at: atomic_notifier_call_chain+0x0/0x190 include/linux/compiler.h:188 stack backtrace: CPU: 0 PID: 24928 Comm: syz-executor3 Not tainted 4.17.0-rc7+ #102 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+0x1e/0x30 arch/x86/entry/entry_64.S:1159 RIP: 0010:__delayacct_blkio_end+0x4f/0xc0 kernel/delayacct.c:82 RSP: 0018:ffff880164d64d58 EFLAGS: 00010002 RAX: dffffc0000000000 RBX: 0000000000000000 RCX: ffffc900028cd000 RDX: 0000000000000007 RSI: ffffffff817a4de1 RDI: 0000000000000038 RBP: ffff880164d64d70 R08: ffffed003b5c46d3 R09: 0000000000000001 R10: ffff880164d64e00 R11: ffff8801dae23693 R12: ffff8801b8f3e440 R13: ffff880190f96600 R14: ffff880190f9663c R15: 0000000000000002 delayacct_blkio_end include/linux/delayacct.h:128 [inline] try_to_wake_up+0xa89/0x1190 kernel/sched/core.c:2037 default_wake_function+0x30/0x50 kernel/sched/core.c:3739 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 unlock_page+0x214/0x2b0 mm/filemap.c:1207 __split_huge_page+0xfc7/0x17b0 mm/huge_memory.c:2464 split_huge_page_to_list+0x15a2/0x1bf0 mm/huge_memory.c:2685 ? __sanitizer_cov_tr Lost 163 message(s)! ---[ end trace b71f5feca21fdc7b ]---