Hello, syzbot found the following issue on: HEAD commit: f4cdcae0 Merge branch 'cxgb4-fixes' git tree: net console output: https://syzkaller.appspot.com/x/log.txt?x=14e3ef4fd00000 kernel config: https://syzkaller.appspot.com/x/.config?x=770708ea7cfd4916 dashboard link: https://syzkaller.appspot.com/bug?extid=5952f5d2983bea3ff2ba 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+5952f5d2983bea3ff2ba@xxxxxxxxxxxxxxxxxxxxxxxxx ================================ WARNING: inconsistent lock state 5.13.0-rc3-syzkaller #0 Not tainted -------------------------------- inconsistent {SOFTIRQ-ON-W} -> {IN-SOFTIRQ-W} usage. syz-executor.0/15349 [HC0[0]:SC1[1]:HE1:SE0] takes: ffffe8ffff939e90 (&pd_list->lock){+.?.}-{2:2}, at: spin_lock include/linux/spinlock.h:354 [inline] ffffe8ffff939e90 (&pd_list->lock){+.?.}-{2:2}, at: padata_do_serial+0x192/0x410 kernel/padata.c:405 {SOFTIRQ-ON-W} state was registered at: lock_acquire kernel/locking/lockdep.c:5512 [inline] lock_acquire+0x1ab/0x740 kernel/locking/lockdep.c:5477 __raw_spin_lock include/linux/spinlock_api_smp.h:142 [inline] _raw_spin_lock+0x2a/0x40 kernel/locking/spinlock.c:151 spin_lock include/linux/spinlock.h:354 [inline] padata_do_serial+0x192/0x410 kernel/padata.c:405 pcrypt_aead_enc+0x57/0x70 crypto/pcrypt.c:87 padata_do_parallel+0x759/0x890 kernel/padata.c:230 pcrypt_aead_encrypt+0x39f/0x4d0 crypto/pcrypt.c:115 crypto_aead_encrypt+0xaa/0xf0 crypto/aead.c:94 tls_do_encryption net/tls/tls_sw.c:529 [inline] tls_push_record+0x13d7/0x3230 net/tls/tls_sw.c:762 bpf_exec_tx_verdict+0xd82/0x11a0 net/tls/tls_sw.c:802 tls_sw_sendmsg+0xa41/0x1800 net/tls/tls_sw.c:1014 inet6_sendmsg+0x99/0xe0 net/ipv6/af_inet6.c:642 sock_sendmsg_nosec net/socket.c:654 [inline] sock_sendmsg+0xcf/0x120 net/socket.c:674 __sys_sendto+0x21c/0x320 net/socket.c:1977 __do_sys_sendto net/socket.c:1989 [inline] __se_sys_sendto net/socket.c:1985 [inline] __x64_sys_sendto+0xdd/0x1b0 net/socket.c:1985 do_syscall_64+0x3a/0xb0 arch/x86/entry/common.c:47 entry_SYSCALL_64_after_hwframe+0x44/0xae irq event stamp: 20754 hardirqs last enabled at (20754): [<ffffffff8145d500>] __local_bh_enable_ip+0xa0/0x120 kernel/softirq.c:389 hardirqs last disabled at (20753): [<ffffffff8145d523>] __local_bh_enable_ip+0xc3/0x120 kernel/softirq.c:366 softirqs last enabled at (20356): [<ffffffff8145d336>] invoke_softirq kernel/softirq.c:433 [inline] softirqs last enabled at (20356): [<ffffffff8145d336>] __irq_exit_rcu+0x136/0x200 kernel/softirq.c:637 softirqs last disabled at (20733): [<ffffffff8145d336>] invoke_softirq kernel/softirq.c:433 [inline] softirqs last disabled at (20733): [<ffffffff8145d336>] __irq_exit_rcu+0x136/0x200 kernel/softirq.c:637 other info that might help us debug this: Possible unsafe locking scenario: CPU0 ---- lock(&pd_list->lock); <Interrupt> lock(&pd_list->lock); *** DEADLOCK *** 4 locks held by syz-executor.0/15349: #0: ffff88802938a460 (sb_writers#5){.+.+}-{0:0}, at: __do_sys_sendfile64 fs/read_write.c:1325 [inline] #0: ffff88802938a460 (sb_writers#5){.+.+}-{0:0}, at: __se_sys_sendfile64 fs/read_write.c:1311 [inline] #0: ffff88802938a460 (sb_writers#5){.+.+}-{0:0}, at: __x64_sys_sendfile64+0x1cc/0x210 fs/read_write.c:1311 #1: ffff888079db0488 (&sb->s_type->i_mutex_key#10){++++}-{3:3}, at: inode_lock include/linux/fs.h:774 [inline] #1: ffff888079db0488 (&sb->s_type->i_mutex_key#10){++++}-{3:3}, at: ext4_dio_write_iter fs/ext4/file.c:510 [inline] #1: ffff888079db0488 (&sb->s_type->i_mutex_key#10){++++}-{3:3}, at: ext4_file_write_iter+0xaeb/0x14e0 fs/ext4/file.c:678 #2: ffffc90000007d70 ((&d->timer)){+.-.}-{0:0}, at: lockdep_copy_map include/linux/lockdep.h:35 [inline] #2: ffffc90000007d70 ((&d->timer)){+.-.}-{0:0}, at: call_timer_fn+0xd5/0x6b0 kernel/time/timer.c:1421 #3: ffffffff8bf79320 (rcu_read_lock){....}-{1:2}, at: buf_msg net/tipc/msg.h:201 [inline] #3: ffffffff8bf79320 (rcu_read_lock){....}-{1:2}, at: tipc_bearer_xmit_skb+0x8c/0x3f0 net/tipc/bearer.c:549 stack backtrace: CPU: 0 PID: 15349 Comm: syz-executor.0 Not tainted 5.13.0-rc3-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+0x141/0x1d7 lib/dump_stack.c:120 print_usage_bug kernel/locking/lockdep.c:203 [inline] valid_state kernel/locking/lockdep.c:3820 [inline] mark_lock_irq kernel/locking/lockdep.c:4023 [inline] mark_lock.cold+0x61/0x8e kernel/locking/lockdep.c:4480 mark_usage kernel/locking/lockdep.c:4375 [inline] __lock_acquire+0x11aa/0x5230 kernel/locking/lockdep.c:4856 lock_acquire kernel/locking/lockdep.c:5512 [inline] lock_acquire+0x1ab/0x740 kernel/locking/lockdep.c:5477 __raw_spin_lock include/linux/spinlock_api_smp.h:142 [inline] _raw_spin_lock+0x2a/0x40 kernel/locking/spinlock.c:151 spin_lock include/linux/spinlock.h:354 [inline] padata_do_serial+0x192/0x410 kernel/padata.c:405 pcrypt_aead_enc+0x57/0x70 crypto/pcrypt.c:87 padata_do_parallel+0x759/0x890 kernel/padata.c:230 pcrypt_aead_encrypt+0x39f/0x4d0 crypto/pcrypt.c:115 crypto_aead_encrypt+0xaa/0xf0 crypto/aead.c:94 tipc_aead_encrypt net/tipc/crypto.c:828 [inline] tipc_crypto_xmit+0x10b4/0x2d40 net/tipc/crypto.c:1769 tipc_bearer_xmit_skb+0x180/0x3f0 net/tipc/bearer.c:556 tipc_disc_timeout+0x864/0xc80 net/tipc/discover.c:335 call_timer_fn+0x1a5/0x6b0 kernel/time/timer.c:1431 expire_timers kernel/time/timer.c:1476 [inline] __run_timers.part.0+0x67c/0xa50 kernel/time/timer.c:1745 __run_timers kernel/time/timer.c:1726 [inline] run_timer_softirq+0xb3/0x1d0 kernel/time/timer.c:1758 __do_softirq+0x29b/0x9f6 kernel/softirq.c:559 invoke_softirq kernel/softirq.c:433 [inline] __irq_exit_rcu+0x136/0x200 kernel/softirq.c:637 irq_exit_rcu+0x5/0x20 kernel/softirq.c:649 sysvec_apic_timer_interrupt+0x93/0xc0 arch/x86/kernel/apic/apic.c:1100 </IRQ> asm_sysvec_apic_timer_interrupt+0x12/0x20 arch/x86/include/asm/idtentry.h:647 RIP: 0010:__raw_spin_unlock_irq include/linux/spinlock_api_smp.h:169 [inline] RIP: 0010:_raw_spin_unlock_irq+0x25/0x40 kernel/locking/spinlock.c:199 Code: 0f 1f 44 00 00 55 48 8b 74 24 08 48 89 fd 48 83 c7 18 e8 de 51 41 f8 48 89 ef e8 76 ca 41 f8 e8 d1 be 61 f8 fb bf 01 00 00 00 <e8> 56 c0 35 f8 65 8b 05 3f c2 e8 76 85 c0 74 02 5d c3 e8 fb 17 e7 RSP: 0018:ffffc9000121efc8 EFLAGS: 00000202 RAX: 00000000000050fb RBX: 0000000000000402 RCX: 1ffffffff204bf8a RDX: 0000000000000000 RSI: 0000000000000002 RDI: 0000000000000001 RBP: ffff8880b9c35640 R08: 0000000000000001 R09: ffffffff90226937 R10: 0000000000000001 R11: 0000000000000001 R12: ffff8880b9c35640 R13: ffff88801c033880 R14: ffff888028956200 R15: ffff88801fb23880 finish_lock_switch kernel/sched/core.c:4093 [inline] finish_task_switch.isra.0+0x15d/0x810 kernel/sched/core.c:4210 context_switch kernel/sched/core.c:4342 [inline] __schedule+0x91e/0x23e0 kernel/sched/core.c:5147 preempt_schedule_common+0x45/0xc0 kernel/sched/core.c:5307 preempt_schedule_thunk+0x16/0x18 arch/x86/entry/thunk_64.S:35 __raw_spin_unlock_irqrestore include/linux/spinlock_api_smp.h:161 [inline] _raw_spin_unlock_irqrestore+0x57/0x70 kernel/locking/spinlock.c:191 spin_unlock_irqrestore include/linux/spinlock.h:409 [inline] prepare_to_wait+0x122/0x3f0 kernel/sched/wait.c:263 __wait_on_bit+0xd1/0x190 kernel/sched/wait_bit.c:47 out_of_line_wait_on_bit+0xd5/0x110 kernel/sched/wait_bit.c:64 wait_on_bit_io include/linux/wait_bit.h:101 [inline] __wait_on_buffer fs/buffer.c:122 [inline] wait_on_buffer include/linux/buffer_head.h:356 [inline] __sync_dirty_buffer+0x2fb/0x3f0 fs/buffer.c:3177 ext4_write_inode+0x574/0x630 fs/ext4/inode.c:5236 write_inode fs/fs-writeback.c:1320 [inline] __writeback_single_inode+0xae9/0xfd0 fs/fs-writeback.c:1525 writeback_single_inode+0x2a5/0x460 fs/fs-writeback.c:1580 sync_inode fs/fs-writeback.c:2624 [inline] sync_inode_metadata+0x93/0xd0 fs/fs-writeback.c:2644 ext4_fsync_nojournal fs/ext4/fsync.c:92 [inline] ext4_sync_file+0x9cc/0xfd0 fs/ext4/fsync.c:170 vfs_fsync_range+0x13a/0x220 fs/sync.c:200 generic_write_sync include/linux/fs.h:2982 [inline] iomap_dio_complete+0x5f9/0x780 fs/iomap/direct-io.c:127 iomap_dio_rw+0x62/0x90 fs/iomap/direct-io.c:652 ext4_dio_write_iter fs/ext4/file.c:568 [inline] ext4_file_write_iter+0xe18/0x14e0 fs/ext4/file.c:678 call_write_iter include/linux/fs.h:2114 [inline] do_iter_readv_writev+0x46f/0x740 fs/read_write.c:740 do_iter_write+0x188/0x670 fs/read_write.c:866 vfs_iter_write+0x70/0xa0 fs/read_write.c:907 iter_file_splice_write+0x723/0xc70 fs/splice.c:689 do_splice_from fs/splice.c:767 [inline] direct_splice_actor+0x110/0x180 fs/splice.c:936 splice_direct_to_actor+0x34b/0x8c0 fs/splice.c:891 do_splice_direct+0x1b3/0x280 fs/splice.c:979 do_sendfile+0x9f0/0x1110 fs/read_write.c:1260 __do_sys_sendfile64 fs/read_write.c:1325 [inline] __se_sys_sendfile64 fs/read_write.c:1311 [inline] __x64_sys_sendfile64+0x1cc/0x210 fs/read_write.c:1311 do_syscall_64+0x3a/0xb0 arch/x86/entry/common.c:47 entry_SYSCALL_64_after_hwframe+0x44/0xae RIP: 0033:0x4665d9 Code: ff ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 00 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 73 01 c3 48 c7 c1 bc ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007f7748bc2188 EFLAGS: 00000246 ORIG_RAX: 0000000000000028 RAX: ffffffffffffffda RBX: 000000000056bf80 RCX: 00000000004665d9 RDX: 0000000000000000 RSI: 0000000000000005 RDI: 0000000000000006 RBP: 00000000004bfcb9 R08: 0000000000000000 R09: 0000000000000000 R10: 000800000000000c R11: 0000000000000246 R12: 000000000056bf80 R13: 00007fff0dc53ccf R14: 00007f7748bc2300 R15: 0000000000022000 TCP: request_sock_TCPv6: Possible SYN flooding on port 20002. 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