Hello, syzbot found the following issue on: HEAD commit: f6e1ea19 Merge tag 'ceph-for-5.11-rc2' of git://github.com.. git tree: upstream console output: https://syzkaller.appspot.com/x/log.txt?x=108227df500000 kernel config: https://syzkaller.appspot.com/x/.config?x=725326c654c08da7 dashboard link: https://syzkaller.appspot.com/bug?extid=91ca3f25bd7f795f019c compiler: gcc (GCC) 10.1.0-syz 20200507 Unfortunately, I don't have any reproducer for this issue yet. IMPORTANT: if you fix the issue, please add the following tag to the commit: Reported-by: syzbot+91ca3f25bd7f795f019c@xxxxxxxxxxxxxxxxxxxxxxxxx ======================================================== WARNING: possible irq lock inversion dependency detected 5.11.0-rc1-syzkaller #0 Not tainted -------------------------------------------------------- syz-executor.4/15599 just changed the state of lock: ffff888011ba2498 (&ctx->completion_lock){-...}-{2:2}, at: io_timeout_fn+0x6f/0x3d0 fs/io_uring.c:5619 but this lock took another, HARDIRQ-READ-unsafe lock in the past: (&new->fa_lock){.+.+}-{2:2} and interrupts could create inverse lock ordering between them. other info that might help us debug this: Possible interrupt unsafe locking scenario: CPU0 CPU1 ---- ---- lock(&new->fa_lock); local_irq_disable(); lock(&ctx->completion_lock); lock(&new->fa_lock); <Interrupt> lock(&ctx->completion_lock); *** DEADLOCK *** 2 locks held by syz-executor.4/15599: #0: ffffffff8c948be8 (rtnl_mutex){+.+.}-{3:3}, at: rtnl_lock net/core/rtnetlink.c:72 [inline] #0: ffffffff8c948be8 (rtnl_mutex){+.+.}-{3:3}, at: rtnetlink_rcv_msg+0x3f9/0xad0 net/core/rtnetlink.c:5561 #1: ffffffff8cabf298 (addrconf_hash_lock){+...}-{2:2}, at: spin_lock_bh include/linux/spinlock.h:359 [inline] (addrconf_hash_lock){+...}-{2:2}, at: addrconf_ifdown.isra.0+0x2b6/0x1590 net/ipv6/addrconf.c:3741 the shortest dependencies between 2nd lock and 1st lock: -> ( &new->fa_lock){.+.+}-{2:2} { HARDIRQ-ON-R at: lock_acquire kernel/locking/lockdep.c:5437 [inline] lock_acquire+0x29d/0x740 kernel/locking/lockdep.c:5402 __raw_read_lock include/linux/rwlock_api_smp.h:149 [inline] _raw_read_lock+0x5b/0x70 kernel/locking/spinlock.c:223 kill_fasync_rcu fs/fcntl.c:1004 [inline] kill_fasync fs/fcntl.c:1025 [inline] kill_fasync+0x14b/0x460 fs/fcntl.c:1018 sock_wake_async+0xd2/0x160 net/socket.c:1310 sk_wake_async include/net/sock.h:2279 [inline] sk_wake_async include/net/sock.h:2275 [inline] af_alg_data_wakeup.part.0+0x2cb/0x4c0 crypto/af_alg.c:810 af_alg_data_wakeup include/crypto/if_alg.h:187 [inline] af_alg_sendmsg+0xf24/0x1400 crypto/af_alg.c:971 sock_sendmsg_nosec net/socket.c:652 [inline] sock_sendmsg+0xcf/0x120 net/socket.c:672 ____sys_sendmsg+0x6e8/0x810 net/socket.c:2345 ___sys_sendmsg+0xf3/0x170 net/socket.c:2399 __sys_sendmsg+0xe5/0x1b0 net/socket.c:2432 do_syscall_64+0x2d/0x70 arch/x86/entry/common.c:46 entry_SYSCALL_64_after_hwframe+0x44/0xa9 SOFTIRQ-ON-R at: lock_acquire kernel/locking/lockdep.c:5437 [inline] lock_acquire+0x29d/0x740 kernel/locking/lockdep.c:5402 __raw_read_lock include/linux/rwlock_api_smp.h:149 [inline] _raw_read_lock+0x5b/0x70 kernel/locking/spinlock.c:223 kill_fasync_rcu fs/fcntl.c:1004 [inline] kill_fasync fs/fcntl.c:1025 [inline] kill_fasync+0x14b/0x460 fs/fcntl.c:1018 sock_wake_async+0xd2/0x160 net/socket.c:1310 sk_wake_async include/net/sock.h:2279 [inline] sk_wake_async include/net/sock.h:2275 [inline] af_alg_data_wakeup.part.0+0x2cb/0x4c0 crypto/af_alg.c:810 af_alg_data_wakeup include/crypto/if_alg.h:187 [inline] af_alg_sendmsg+0xf24/0x1400 crypto/af_alg.c:971 sock_sendmsg_nosec net/socket.c:652 [inline] sock_sendmsg+0xcf/0x120 net/socket.c:672 ____sys_sendmsg+0x6e8/0x810 net/socket.c:2345 ___sys_sendmsg+0xf3/0x170 net/socket.c:2399 __sys_sendmsg+0xe5/0x1b0 net/socket.c:2432 do_syscall_64+0x2d/0x70 arch/x86/entry/common.c:46 entry_SYSCALL_64_after_hwframe+0x44/0xa9 INITIAL USE at: lock_acquire kernel/locking/lockdep.c:5437 [inline] lock_acquire+0x29d/0x740 kernel/locking/lockdep.c:5402 __raw_write_lock_irq include/linux/rwlock_api_smp.h:196 [inline] _raw_write_lock_irq+0x32/0x50 kernel/locking/spinlock.c:311 fasync_remove_entry+0xb6/0x1f0 fs/fcntl.c:882 fasync_helper+0x9e/0xb0 fs/fcntl.c:985 sock_fasync+0x94/0x140 net/socket.c:1281 __fput+0x70d/0x920 fs/file_table.c:277 task_work_run+0xdd/0x190 kernel/task_work.c:140 exit_task_work include/linux/task_work.h:30 [inline] do_exit+0xb89/0x29e0 kernel/exit.c:823 do_group_exit+0x125/0x310 kernel/exit.c:920 get_signal+0x3ec/0x2010 kernel/signal.c:2770 arch_do_signal_or_restart+0x2a8/0x1eb0 arch/x86/kernel/signal.c:811 handle_signal_work kernel/entry/common.c:147 [inline] exit_to_user_mode_loop kernel/entry/common.c:171 [inline] exit_to_user_mode_prepare+0x148/0x250 kernel/entry/common.c:201 __syscall_exit_to_user_mode_work kernel/entry/common.c:291 [inline] syscall_exit_to_user_mode+0x19/0x50 kernel/entry/common.c:302 entry_SYSCALL_64_after_hwframe+0x44/0xa9 INITIAL READ USE at: lock_acquire kernel/locking/lockdep.c:5437 [inline] lock_acquire+0x29d/0x740 kernel/locking/lockdep.c:5402 __raw_read_lock include/linux/rwlock_api_smp.h:149 [inline] _raw_read_lock+0x5b/0x70 kernel/locking/spinlock.c:223 kill_fasync_rcu fs/fcntl.c:1004 [inline] kill_fasync fs/fcntl.c:1025 [inline] kill_fasync+0x14b/0x460 fs/fcntl.c:1018 sock_wake_async+0xd2/0x160 net/socket.c:1310 sk_wake_async include/net/sock.h:2279 [inline] sk_wake_async include/net/sock.h:2275 [inline] af_alg_data_wakeup.part.0+0x2cb/0x4c0 crypto/af_alg.c:810 af_alg_data_wakeup include/crypto/if_alg.h:187 [inline] af_alg_sendmsg+0xf24/0x1400 crypto/af_alg.c:971 sock_sendmsg_nosec net/socket.c:652 [inline] sock_sendmsg+0xcf/0x120 net/socket.c:672 ____sys_sendmsg+0x6e8/0x810 net/socket.c:2345 ___sys_sendmsg+0xf3/0x170 net/socket.c:2399 __sys_sendmsg+0xe5/0x1b0 net/socket.c:2432 do_syscall_64+0x2d/0x70 arch/x86/entry/common.c:46 entry_SYSCALL_64_after_hwframe+0x44/0xa9 } ... key at: [<ffffffff8ef9a960>] __key.0+0x0/0x40 ... acquired at: __raw_read_lock include/linux/rwlock_api_smp.h:149 [inline] _raw_read_lock+0x5b/0x70 kernel/locking/spinlock.c:223 kill_fasync_rcu fs/fcntl.c:1004 [inline] kill_fasync fs/fcntl.c:1025 [inline] kill_fasync+0x14b/0x460 fs/fcntl.c:1018 __io_commit_cqring fs/io_uring.c:1344 [inline] io_commit_cqring+0x34e/0xa90 fs/io_uring.c:1654 io_submit_flush_completions+0x269/0x3a0 fs/io_uring.c:1851 __io_req_complete+0x209/0x310 fs/io_uring.c:1870 io_nop fs/io_uring.c:3893 [inline] io_issue_sqe+0x1234/0x4490 fs/io_uring.c:6180 __io_queue_sqe+0x228/0x10c0 fs/io_uring.c:6484 io_queue_sqe+0x631/0x10d0 fs/io_uring.c:6550 io_submit_sqe fs/io_uring.c:6623 [inline] io_submit_sqes+0x1495/0x2720 fs/io_uring.c:6871 __do_sys_io_uring_enter+0x6d1/0x1e70 fs/io_uring.c:9192 do_syscall_64+0x2d/0x70 arch/x86/entry/common.c:46 entry_SYSCALL_64_after_hwframe+0x44/0xa9 -> ( &ctx->completion_lock){-...}-{2:2} { IN-HARDIRQ-W at: lock_acquire kernel/locking/lockdep.c:5437 [inline] lock_acquire+0x29d/0x740 kernel/locking/lockdep.c:5402 __raw_spin_lock_irqsave include/linux/spinlock_api_smp.h:110 [inline] _raw_spin_lock_irqsave+0x39/0x50 kernel/locking/spinlock.c:159 io_timeout_fn+0x6f/0x3d0 fs/io_uring.c:5619 __run_hrtimer kernel/time/hrtimer.c:1519 [inline] __hrtimer_run_queues+0x693/0xea0 kernel/time/hrtimer.c:1583 hrtimer_interrupt+0x334/0x940 kernel/time/hrtimer.c:1645 local_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1085 [inline] __sysvec_apic_timer_interrupt+0x146/0x540 arch/x86/kernel/apic/apic.c:1102 asm_call_irq_on_stack+0xf/0x20 __run_sysvec_on_irqstack arch/x86/include/asm/irq_stack.h:37 [inline] run_sysvec_on_irqstack_cond arch/x86/include/asm/irq_stack.h:89 [inline] sysvec_apic_timer_interrupt+0xbd/0x100 arch/x86/kernel/apic/apic.c:1096 asm_sysvec_apic_timer_interrupt+0x12/0x20 arch/x86/include/asm/idtentry.h:628 addrconf_ifdown.isra.0+0x2f5/0x1590 net/ipv6/addrconf.c:3743 addrconf_notify+0x55c/0x23f0 net/ipv6/addrconf.c:3628 notifier_call_chain+0xb5/0x200 kernel/notifier.c:83 call_netdevice_notifiers_info+0xb5/0x130 net/core/dev.c:2040 call_netdevice_notifiers_extack net/core/dev.c:2052 [inline] call_netdevice_notifiers net/core/dev.c:2066 [inline] __dev_notify_flags+0x1da/0x2b0 net/core/dev.c:8518 dev_change_flags+0x100/0x160 net/core/dev.c:8554 do_setlink+0x891/0x3a70 net/core/rtnetlink.c:2708 rtnl_group_changelink net/core/rtnetlink.c:3227 [inline] __rtnl_newlink+0xde5/0x1750 net/core/rtnetlink.c:3381 rtnl_newlink+0x64/0xa0 net/core/rtnetlink.c:3502 rtnetlink_rcv_msg+0x44e/0xad0 net/core/rtnetlink.c:5564 netlink_rcv_skb+0x153/0x420 net/netlink/af_netlink.c:2494 netlink_unicast_kernel net/netlink/af_netlink.c:1304 [inline] netlink_unicast+0x533/0x7d0 net/netlink/af_netlink.c:1330 netlink_sendmsg+0x856/0xd90 net/netlink/af_netlink.c:1919 sock_sendmsg_nosec net/socket.c:652 [inline] sock_sendmsg+0xcf/0x120 net/socket.c:672 ____sys_sendmsg+0x6e8/0x810 net/socket.c:2345 ___sys_sendmsg+0xf3/0x170 net/socket.c:2399 __sys_sendmsg+0xe5/0x1b0 net/socket.c:2432 do_syscall_64+0x2d/0x70 arch/x86/entry/common.c:46 entry_SYSCALL_64_after_hwframe+0x44/0xa9 INITIAL USE at: lock_acquire kernel/locking/lockdep.c:5437 [inline] lock_acquire+0x29d/0x740 kernel/locking/lockdep.c:5402 __raw_spin_lock_irq include/linux/spinlock_api_smp.h:128 [inline] _raw_spin_lock_irq+0x32/0x50 kernel/locking/spinlock.c:167 spin_lock_irq include/linux/spinlock.h:379 [inline] io_cancel_defer_files fs/io_uring.c:8735 [inline] io_uring_cancel_task_requests fs/io_uring.c:8836 [inline] __io_uring_files_cancel+0x2f0/0x14f0 fs/io_uring.c:8941 io_uring_files_cancel include/linux/io_uring.h:51 [inline] exit_files+0xe4/0x170 fs/file.c:431 do_exit+0xb4f/0x29e0 kernel/exit.c:818 do_group_exit+0x125/0x310 kernel/exit.c:920 get_signal+0x3ec/0x2010 kernel/signal.c:2770 arch_do_signal_or_restart+0x2a8/0x1eb0 arch/x86/kernel/signal.c:811 handle_signal_work kernel/entry/common.c:147 [inline] exit_to_user_mode_loop kernel/entry/common.c:171 [inline] exit_to_user_mode_prepare+0x148/0x250 kernel/entry/common.c:201 __syscall_exit_to_user_mode_work kernel/entry/common.c:291 [inline] syscall_exit_to_user_mode+0x19/0x50 kernel/entry/common.c:302 entry_SYSCALL_64_after_hwframe+0x44/0xa9 } ... key at: [<ffffffff8ef9ea40>] __key.10+0x0/0x40 ... acquired at: mark_usage kernel/locking/lockdep.c:4303 [inline] __lock_acquire+0x1459/0x5500 kernel/locking/lockdep.c:4786 lock_acquire kernel/locking/lockdep.c:5437 [inline] lock_acquire+0x29d/0x740 kernel/locking/lockdep.c:5402 __raw_spin_lock_irqsave include/linux/spinlock_api_smp.h:110 [inline] _raw_spin_lock_irqsave+0x39/0x50 kernel/locking/spinlock.c:159 io_timeout_fn+0x6f/0x3d0 fs/io_uring.c:5619 __run_hrtimer kernel/time/hrtimer.c:1519 [inline] __hrtimer_run_queues+0x693/0xea0 kernel/time/hrtimer.c:1583 hrtimer_interrupt+0x334/0x940 kernel/time/hrtimer.c:1645 local_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1085 [inline] __sysvec_apic_timer_interrupt+0x146/0x540 arch/x86/kernel/apic/apic.c:1102 asm_call_irq_on_stack+0xf/0x20 __run_sysvec_on_irqstack arch/x86/include/asm/irq_stack.h:37 [inline] run_sysvec_on_irqstack_cond arch/x86/include/asm/irq_stack.h:89 [inline] sysvec_apic_timer_interrupt+0xbd/0x100 arch/x86/kernel/apic/apic.c:1096 asm_sysvec_apic_timer_interrupt+0x12/0x20 arch/x86/include/asm/idtentry.h:628 addrconf_ifdown.isra.0+0x2f5/0x1590 net/ipv6/addrconf.c:3743 addrconf_notify+0x55c/0x23f0 net/ipv6/addrconf.c:3628 notifier_call_chain+0xb5/0x200 kernel/notifier.c:83 call_netdevice_notifiers_info+0xb5/0x130 net/core/dev.c:2040 call_netdevice_notifiers_extack net/core/dev.c:2052 [inline] call_netdevice_notifiers net/core/dev.c:2066 [inline] __dev_notify_flags+0x1da/0x2b0 net/core/dev.c:8518 dev_change_flags+0x100/0x160 net/core/dev.c:8554 do_setlink+0x891/0x3a70 net/core/rtnetlink.c:2708 rtnl_group_changelink net/core/rtnetlink.c:3227 [inline] __rtnl_newlink+0xde5/0x1750 net/core/rtnetlink.c:3381 rtnl_newlink+0x64/0xa0 net/core/rtnetlink.c:3502 rtnetlink_rcv_msg+0x44e/0xad0 net/core/rtnetlink.c:5564 netlink_rcv_skb+0x153/0x420 net/netlink/af_netlink.c:2494 netlink_unicast_kernel net/netlink/af_netlink.c:1304 [inline] netlink_unicast+0x533/0x7d0 net/netlink/af_netlink.c:1330 netlink_sendmsg+0x856/0xd90 net/netlink/af_netlink.c:1919 sock_sendmsg_nosec net/socket.c:652 [inline] sock_sendmsg+0xcf/0x120 net/socket.c:672 ____sys_sendmsg+0x6e8/0x810 net/socket.c:2345 ___sys_sendmsg+0xf3/0x170 net/socket.c:2399 __sys_sendmsg+0xe5/0x1b0 net/socket.c:2432 do_syscall_64+0x2d/0x70 arch/x86/entry/common.c:46 entry_SYSCALL_64_after_hwframe+0x44/0xa9 stack backtrace: CPU: 1 PID: 15599 Comm: syz-executor.4 Not tainted 5.11.0-rc1-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Call Trace: <IRQ> __dump_stack lib/dump_stack.c:79 [inline] dump_stack+0x107/0x163 lib/dump_stack.c:120 print_irq_inversion_bug kernel/locking/lockdep.c:4413 [inline] check_usage_forwards kernel/locking/lockdep.c:3849 [inline] mark_lock_irq kernel/locking/lockdep.c:3981 [inline] mark_lock.cold+0x6e/0x73 kernel/locking/lockdep.c:4411 mark_usage kernel/locking/lockdep.c:4303 [inline] __lock_acquire+0x1459/0x5500 kernel/locking/lockdep.c:4786 lock_acquire kernel/locking/lockdep.c:5437 [inline] lock_acquire+0x29d/0x740 kernel/locking/lockdep.c:5402 __raw_spin_lock_irqsave include/linux/spinlock_api_smp.h:110 [inline] _raw_spin_lock_irqsave+0x39/0x50 kernel/locking/spinlock.c:159 io_timeout_fn+0x6f/0x3d0 fs/io_uring.c:5619 __run_hrtimer kernel/time/hrtimer.c:1519 [inline] __hrtimer_run_queues+0x693/0xea0 kernel/time/hrtimer.c:1583 hrtimer_interrupt+0x334/0x940 kernel/time/hrtimer.c:1645 local_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1085 [inline] __sysvec_apic_timer_interrupt+0x146/0x540 arch/x86/kernel/apic/apic.c:1102 asm_call_irq_on_stack+0xf/0x20 </IRQ> __run_sysvec_on_irqstack arch/x86/include/asm/irq_stack.h:37 [inline] run_sysvec_on_irqstack_cond arch/x86/include/asm/irq_stack.h:89 [inline] sysvec_apic_timer_interrupt+0xbd/0x100 arch/x86/kernel/apic/apic.c:1096 asm_sysvec_apic_timer_interrupt+0x12/0x20 arch/x86/include/asm/idtentry.h:628 RIP: 0010:addrconf_ifdown.isra.0+0x2f5/0x1590 net/ipv6/addrconf.c:3743 Code: 08 e8 1f 39 cc f9 48 8b 44 24 08 80 38 00 0f 85 1d 10 00 00 48 8b 04 24 48 8b 1c c5 a0 52 af 8f 48 85 db 75 32 e9 ff 01 00 00 <e8> f6 38 cc f9 48 8d bb 48 01 00 00 48 89 f8 48 c1 e8 03 80 3c 28 RSP: 0018:ffffc900087f6b98 EFLAGS: 00000206 RAX: 1ffff1100398f327 RBX: ffff88801cc79800 RCX: ffffc9001169e000 RDX: 0000000000040000 RSI: ffffffff87a63e39 RDI: ffff88801cc79938 RBP: dffffc0000000000 R08: 0000000000000001 R09: 0000000000000003 R10: fffff520010fed65 R11: 0000000000000000 R12: 000000000000005a R13: ffff888034c45d48 R14: ffff88801bf2a800 R15: 0000000000000000 addrconf_notify+0x55c/0x23f0 net/ipv6/addrconf.c:3628 notifier_call_chain+0xb5/0x200 kernel/notifier.c:83 call_netdevice_notifiers_info+0xb5/0x130 net/core/dev.c:2040 call_netdevice_notifiers_extack net/core/dev.c:2052 [inline] call_netdevice_notifiers net/core/dev.c:2066 [inline] __dev_notify_flags+0x1da/0x2b0 net/core/dev.c:8518 dev_change_flags+0x100/0x160 net/core/dev.c:8554 do_setlink+0x891/0x3a70 net/core/rtnetlink.c:2708 rtnl_group_changelink net/core/rtnetlink.c:3227 [inline] __rtnl_newlink+0xde5/0x1750 net/core/rtnetlink.c:3381 rtnl_newlink+0x64/0xa0 net/core/rtnetlink.c:3502 rtnetlink_rcv_msg+0x44e/0xad0 net/core/rtnetlink.c:5564 netlink_rcv_skb+0x153/0x420 net/netlink/af_netlink.c:2494 netlink_unicast_kernel net/netlink/af_netlink.c:1304 [inline] netlink_unicast+0x533/0x7d0 net/netlink/af_netlink.c:1330 netlink_sendmsg+0x856/0xd90 net/netlink/af_netlink.c:1919 sock_sendmsg_nosec net/socket.c:652 [inline] sock_sendmsg+0xcf/0x120 net/socket.c:672 ____sys_sendmsg+0x6e8/0x810 net/socket.c:2345 ___sys_sendmsg+0xf3/0x170 net/socket.c:2399 __sys_sendmsg+0xe5/0x1b0 net/socket.c:2432 do_syscall_64+0x2d/0x70 arch/x86/entry/common.c:46 entry_SYSCALL_64_after_hwframe+0x44/0xa9 RIP: 0033:0x45e219 Code: 0d b4 fb ff c3 66 2e 0f 1f 84 00 00 00 00 00 66 90 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 0f 83 db b3 fb ff c3 66 2e 0f 1f 84 00 00 00 00 RSP: 002b:00007f2d76500c68 EFLAGS: 00000246 ORIG_RAX: 000000000000002e RAX: ffffffffffffffda RBX: 0000000000000003 RCX: 000000000045e219 RDX: 0000000000000000 RSI: 0000000020000140 RDI: 0000000000000007 RBP: 000000000119bfc0 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 000000000119bf8c R13: 00007ffc1160eedf R14: 00007f2d765019c0 R15: 000000000119bf8c --- This report is generated by a bot. It may contain errors. See https://goo.gl/tpsmEJ for more information about syzbot. syzbot engineers can be reached at syzkaller@xxxxxxxxxxxxxxxx. syzbot will keep track of this issue. See: https://goo.gl/tpsmEJ#status for how to communicate with syzbot.
