WARNING: refcount bug in blk_mq_free

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WARNING: refcount bug in blk_mq_free_request	0 (1)	2018/12/05 19:47

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WARNING: refcount bug in blk_mq_free_request

0 (1)

2018/12/05 19:47

Kernel	Title	Repro	Cause bisect	Fix bisect	Count	Last	Reported	Patched	Status
upstream	WARNING: refcount bug in blk_mq_free_request (3) block				1	1063d	1058d	0/26	auto-closed as invalid on 2021/09/25 02:34
upstream	WARNING: refcount bug in blk_mq_free_request (2) block	C	done	error	5	1724d	1724d	15/26	fixed on 2020/06/30 18:57

Buffer I/O error on dev nbd0, logical block 2, async page read block nbd0: Connection timed out, retrying (0/3 alive) nbd0: unable to read partition table ------------[ cut here ]------------ refcount_t: underflow; use-after-free. WARNING: CPU: 1 PID: 2551 at lib/refcount.c:187 refcount_sub_and_test_checked+0x2c9/0x310 lib/refcount.c:187 Kernel panic - not syncing: panic_on_warn set ... nbd0: partition table beyond EOD, truncated CPU: 1 PID: 2551 Comm: kworker/1:2H Not tainted 4.20.0-rc4+ #134 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Workqueue: kblockd blk_mq_run_work_fn Call Trace: __dump_stack lib/dump_stack.c:77 [inline] dump_stack+0x244/0x39d lib/dump_stack.c:113 panic+0x2ad/0x55c kernel/panic.c:188 __warn.cold.8+0x20/0x45 kernel/panic.c:540 report_bug+0x254/0x2d0 lib/bug.c:186 fixup_bug arch/x86/kernel/traps.c:178 [inline] do_error_trap+0x11b/0x200 arch/x86/kernel/traps.c:271 do_invalid_op+0x36/0x40 arch/x86/kernel/traps.c:290 invalid_op+0x14/0x20 arch/x86/entry/entry_64.S:969 RIP: 0010:refcount_sub_and_test_checked+0x2c9/0x310 lib/refcount.c:187 Code: 89 de e8 9a 13 ed fd 84 db 74 07 31 db e9 4d ff ff ff e8 ba 12 ed fd 48 c7 c7 e0 b1 60 88 c6 05 93 46 80 06 01 e8 f7 72 b6 fd <0f> 0b 31 db e9 2c ff ff ff 48 89 cf e8 46 66 30 fe e9 41 fe ff ff RSP: 0018:ffff8881b1aeec00 EFLAGS: 00010282 RAX: 0000000000000000 RBX: 0000000000000000 RCX: 0000000000000000 RDX: 0000000000000000 RSI: ffffffff8165eaf5 RDI: 0000000000000005 RBP: ffff8881b1aeece8 R08: ffff8881c142c440 R09: ffffed103b5e3ef8 R10: ffffed103b5e3ef8 R11: ffff8881daf1f7c7 R12: ffff8881d175aed8 R13: 00000000ffffffff R14: ffff8881b1aeecc0 R15: 1ffff1103635ddb3 refcount_dec_and_test_checked+0x1a/0x20 lib/refcount.c:212 blk_mq_free_request+0x643/0x900 block/blk-mq.c:517 __blk_mq_end_request block/blk-mq.c:542 [inline] blk_mq_end_request+0x2a4/0x490 block/blk-mq.c:551 blk_mq_dispatch_rq_list+0x132d/0x2500 block/blk-mq.c:1210 blk_mq_do_dispatch_sched+0x25b/0x580 block/blk-mq-sched.c:107 blk_mq_sched_dispatch_requests+0x62d/0x9b0 block/blk-mq-sched.c:203 __blk_mq_run_hw_queue+0x199/0x2e0 block/blk-mq.c:1314 blk_mq_run_work_fn+0x51/0x70 block/blk-mq.c:1547 process_one_work+0xc90/0x1c40 kernel/workqueue.c:2153 worker_thread+0x17f/0x1390 kernel/workqueue.c:2296 kthread+0x35a/0x440 kernel/kthread.c:246 ret_from_fork+0x3a/0x50 arch/x86/entry/entry_64.S:352 Kernel Offset: disabled Rebooting in 86400 seconds..