------------[ cut here ]------------ WARNING: CPU: 1 PID: 4905 at net/ipv4/tcp_timer.c:429 tcp_retransmit_timer+0x1a66/0x2590 net/ipv4/tcp_timer.c:429 Kernel panic - not syncing: panic_on_warn set ... CPU: 1 PID: 4905 Comm: syz-executor.5 Not tainted 4.14.144+ #0 Call Trace: __dump_stack lib/dump_stack.c:17 [inline] dump_stack+0xca/0x134 lib/dump_stack.c:53 panic+0x1ea/0x3d3 kernel/panic.c:182 __warn.cold+0x2f/0x3a kernel/panic.c:546 report_bug+0x20a/0x248 lib/bug.c:186 fixup_bug arch/x86/kernel/traps.c:177 [inline] fixup_bug arch/x86/kernel/traps.c:172 [inline] do_error_trap+0x1bf/0x2d0 arch/x86/kernel/traps.c:295 invalid_op+0x18/0x40 arch/x86/entry/entry_64.S:963 RIP: 0010:tcp_retransmit_timer+0x1a66/0x2590 net/ipv4/tcp_timer.c:429 RSP: 0018:ffff8881dbb07c78 EFLAGS: 00010206 RAX: ffff88819e905e00 RBX: ffff8881b5f19d80 RCX: 0000000000000001 RDX: 0000000000000100 RSI: 0000000000000000 RDI: ffff8881d3e140c8 RBP: ffff8881d3e13700 R08: ffff88821ffff05c R09: ffff88821ffff048 R10: ffff88821ffff057 R11: ffff88821ffff050 R12: ffff8881d3e13d9a R13: ffff8881d3e13730 R14: 0000000000000000 R15: ffff8881d3e13f0c tcp_write_timer_handler+0x43d/0x780 net/ipv4/tcp_timer.c:579 tcp_write_timer+0xc9/0x170 net/ipv4/tcp_timer.c:597 call_timer_fn+0x15b/0x6a0 kernel/time/timer.c:1279 expire_timers+0x227/0x4c0 kernel/time/timer.c:1318 __run_timers kernel/time/timer.c:1634 [inline] run_timer_softirq+0x1eb/0x5d0 kernel/time/timer.c:1647 __do_softirq+0x234/0x9ec kernel/softirq.c:288 invoke_softirq kernel/softirq.c:368 [inline] irq_exit+0x114/0x150 kernel/softirq.c:409 exiting_irq arch/x86/include/asm/apic.h:648 [inline] smp_apic_timer_interrupt+0x1a7/0x650 arch/x86/kernel/apic/apic.c:1102 apic_timer_interrupt+0x8c/0xa0 arch/x86/entry/entry_64.S:792 RIP: 0010:debug_lockdep_rcu_enabled kernel/rcu/update.c:299 [inline] RIP: 0010:rcu_read_lock_sched_held+0x70/0x130 kernel/rcu/update.c:109 RSP: 0018:ffff8881b7e37538 EFLAGS: 00000297 ORIG_RAX: ffffffffffffff10 RAX: 0000000000000003 RBX: ffffffff86e15100 RCX: 0000000000000002 RDX: 0000000000000001 RSI: ffff88819e906630 RDI: ffff88819e90662c RBP: ffffea0006c43000 R08: 0000000000000001 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000000 R12: ffffffff84c3aeb3 R13: ffff8881dab71a00 R14: 0000000000000246 R15: 0000000000000000 trace_kmem_cache_free include/trace/events/kmem.h:144 [inline] kmem_cache_free+0x322/0x3b0 mm/slub.c:3056 mempool_free+0xd3/0x340 mm/mempool.c:439 bio_free+0x111/0x190 block/bio.c:265 bio_put+0xa3/0xd0 block/bio.c:558 blkdev_issue_flush+0x274/0x320 block/blk-flush.c:541 ext4_sync_file+0xb2f/0x1250 fs/ext4/fsync.c:157 vfs_fsync_range+0x106/0x260 fs/sync.c:196 generic_write_sync include/linux/fs.h:2699 [inline] ext4_file_write_iter+0x883/0xdb0 fs/ext4/file.c:279 call_write_iter include/linux/fs.h:1788 [inline] do_iter_readv_writev+0x379/0x580 fs/read_write.c:679 do_iter_write fs/read_write.c:958 [inline] do_iter_write+0x152/0x550 fs/read_write.c:939 vfs_iter_write+0x70/0xa0 fs/read_write.c:971 iter_file_splice_write+0x560/0xa50 fs/splice.c:749 do_splice_from fs/splice.c:851 [inline] direct_splice_actor+0x118/0x160 fs/splice.c:1018 splice_direct_to_actor+0x292/0x760 fs/splice.c:973 do_splice_direct+0x177/0x240 fs/splice.c:1061 do_sendfile+0x493/0xb20 fs/read_write.c:1445 SYSC_sendfile64 fs/read_write.c:1506 [inline] SyS_sendfile64+0x11f/0x140 fs/read_write.c:1492 do_syscall_64+0x19b/0x520 arch/x86/entry/common.c:292 entry_SYSCALL_64_after_hwframe+0x42/0xb7 RIP: 0033:0x4598e9 RSP: 002b:00007f8d57babc78 EFLAGS: 00000246 ORIG_RAX: 0000000000000028 RAX: ffffffffffffffda RBX: 0000000000000004 RCX: 00000000004598e9 RDX: 0000000000000000 RSI: 0000000000000006 RDI: 0000000000000006 RBP: 000000000075bf20 R08: 0000000000000000 R09: 0000000000000000 R10: 00008000fffffffe R11: 0000000000000246 R12: 00007f8d57bac6d4 R13: 00000000004c709e R14: 00000000004dc750 R15: 00000000ffffffff Kernel Offset: 0x3800000 from 0xffffffff81000000 (relocation range: 0xffffffff80000000-0xffffffffbfffffff) Rebooting in 86400 seconds..