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<6af81381.7750847f.3ad41e.0031.GAE@google.com> Subject: Re: [syzbot] [block?] WARNING in blk_mq_dispatch_rq_list From: syzbot To: axboe@kernel.dk, linux-block@vger.kernel.org, linux-kernel@vger.kernel.org, syzkaller-bugs@googlegroups.com Content-Type: text/plain; charset="UTF-8" syzbot has found a reproducer for the following issue on: HEAD commit: ad3fc05c7e65 arm64: suspend: Only track cpuidle context fo.. git tree: git://git.kernel.org/pub/scm/linux/kernel/git/arm64/linux.git console output: https://syzkaller.appspot.com/x/log.txt?x=11a6964d580000 kernel config: https://syzkaller.appspot.com/x/.config?x=4e8e6c1701ad8af2 dashboard link: https://syzkaller.appspot.com/bug?extid=49b69d460fb5134ee1d7 compiler: Debian clang version 22.1.8 (1~deb13u4), Debian LLD 22.1.8 userspace arch: arm64 C reproducer: https://syzkaller.appspot.com/x/repro.c?x=14809bed580000 IMPORTANT: if you fix the issue, please add the following tag to the commit: Reported-by: syzbot+49b69d460fb5134ee1d7@syzkaller.appspotmail.com ------------[ cut here ]------------ WARNING: block/blk-mq.c:2131 at blk_mq_dispatch_rq_list+0x960/0x13a8 block/blk-mq.c:2131, CPU#1: kworker/1:1H/4531 Modules linked in: CPU: 1 UID: 0 PID: 4531 Comm: kworker/1:1H Not tainted syzkaller #0 PREEMPT Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 11/06/2026 Workqueue: kblockd blk_mq_run_work_fn pstate: 83400005 (Nzcv daif +PAN -UAO +TCO +DIT -SSBS BTYPE=--) pc : blk_mq_dispatch_rq_list+0x960/0x13a8 block/blk-mq.c:2131 lr : blk_mq_dispatch_rq_list+0x960/0x13a8 block/blk-mq.c:2131 sp : ffff800099cf77e0 x29: ffff800099cf78c0 x28: 0000000000000000 x27: ffff0000c8f66880 x26: 1fffe00019214142 x25: ffff0000c90a0a48 x24: ffff0000c8f66800 x23: dfff800000000000 x22: ffff0000c90a0a10 x21: ffff800099cf7a48 x20: ffff800099cf7a40 x19: ffff0000c8f66948 x18: 0000000000000000 x17: 0000000000000001 x16: 0000000100000000 x15: ffff80008b586000 x14: ffff80008bdbe7b0 x13: 0000000000000002 x12: 0000000000000000 x11: 0000000000000000 x10: ffff70001339ef12 x9 : 0000000000000000 x8 : 0000000000000000 x7 : 0000000000000000 x6 : 0000000000000000 x5 : ffff80008b769280 x4 : 0000000000000000 x3 : 0000000000000010 x2 : 0000000000000000 x1 : ffff0000d25c5880 x0 : 0000000000000000 Call trace: blk_mq_dispatch_rq_list+0x960/0x13a8 block/blk-mq.c:2131 (P) __blk_mq_sched_dispatch_requests+0x250/0x10e8 block/blk-mq-sched.c:299 blk_mq_sched_dispatch_requests+0xa8/0x158 block/blk-mq-sched.c:329 blk_mq_run_work_fn+0x214/0x2e4 block/blk-mq.c:2556 process_one_work kernel/workqueue.c:3495 [inline] process_scheduled_works+0x91c/0x1250 kernel/workqueue.c:3578 worker_thread+0x798/0xbd0 kernel/workqueue.c:3659 kthread+0x304/0x3d4 kernel/kthread.c:436 ret_from_fork+0x10/0x20 arch/arm64/kernel/entry.S:854 irq event stamp: 156 hardirqs last enabled at (155): [] __raw_spin_unlock_irq include/linux/spinlock_api_smp.h:219 [inline] hardirqs last enabled at (155): [] _raw_spin_unlock_irq+0x30/0x80 kernel/locking/spinlock.c:229 hardirqs last disabled at (156): [] el1_brk64+0x20/0x54 arch/arm64/kernel/entry-common.c:484 softirqs last enabled at (0): [] copy_process+0x12d4/0x35a0 kernel/fork.c:2267 softirqs last disabled at (0): [<0000000000000000>] 0x0 ---[ end trace 0000000000000000 ]--- ------------[ cut here ]------------ WARNING: block/blk.h:723 at req_ref_put_and_test block/blk.h:723 [inline], CPU#1: kworker/1:1H/4531 WARNING: block/blk.h:723 at blk_mq_free_request+0x190/0x210 block/blk-mq.c:849, CPU#1: kworker/1:1H/4531 Modules linked in: CPU: 1 UID: 0 PID: 4531 Comm: kworker/1:1H Tainted: G W syzkaller #0 PREEMPT Tainted: [W]=WARN Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 11/06/2026 Workqueue: kblockd blk_mq_run_work_fn pstate: 83400005 (Nzcv daif +PAN -UAO +TCO +DIT -SSBS BTYPE=--) pc : req_ref_put_and_test block/blk.h:723 [inline] pc : blk_mq_free_request+0x190/0x210 block/blk-mq.c:849 lr : req_ref_put_and_test block/blk.h:723 [inline] lr : blk_mq_free_request+0x190/0x210 block/blk-mq.c:849 sp : ffff800099cf7730 x29: ffff800099cf7730 x28: ffff70001339ef0c x27: ffff0000c90a0a00 x26: ffff0000d25c5880 x25: 1fffe00019214143 x24: 1fffe00019214160 x23: dfff800000000000 x22: dfff800000000000 x21: ffff0000c90a0a9c x20: 000000000000007f x19: ffff0000c90a0a00 x18: 0000000000000000 x17: 0000000000000001 x16: 0000000100000000 x15: ffff80008b586000 x14: 00000000001addca x13: 0000000000000001 x12: 0000000000000000 x11: 0000000000000000 x10: ffff600019214154 x9 : 0000000000000000 x8 : 0000000000000000 x7 : ffff800081839f14 x6 : 0000000000000000 x5 : 0000000000000000 x4 : 0000000000000000 x3 : ffff8000818151e0 x2 : 000000000000007f x1 : ffff0000d25c5880 x0 : 0000000000000000 Call trace: req_ref_put_and_test block/blk.h:723 [inline] (P) blk_mq_free_request+0x190/0x210 block/blk-mq.c:849 (P) __blk_mq_end_request+0x32c/0x434 block/blk-mq.c:-1 blk_mq_end_request+0x68/0x8c block/blk-mq.c:1169 blk_mq_dispatch_rq_list+0x410/0x13a8 block/blk-mq.c:2153 __blk_mq_sched_dispatch_requests+0x250/0x10e8 block/blk-mq-sched.c:299 blk_mq_sched_dispatch_requests+0xa8/0x158 block/blk-mq-sched.c:329 blk_mq_run_work_fn+0x214/0x2e4 block/blk-mq.c:2556 process_one_work kernel/workqueue.c:3495 [inline] process_scheduled_works+0x91c/0x1250 kernel/workqueue.c:3578 worker_thread+0x798/0xbd0 kernel/workqueue.c:3659 kthread+0x304/0x3d4 kernel/kthread.c:436 ret_from_fork+0x10/0x20 arch/arm64/kernel/entry.S:854 irq event stamp: 186 hardirqs last enabled at (185): [] seqcount_lockdep_reader_access+0x7c/0xf8 include/linux/seqlock.h:75 hardirqs last disabled at (186): [] el1_brk64+0x20/0x54 arch/arm64/kernel/entry-common.c:484 softirqs last enabled at (178): [] __do_softirq+0x14/0x20 kernel/softirq.c:703 softirqs last disabled at (159): [] __do_softirq+0x14/0x20 kernel/softirq.c:703 ---[ end trace 0000000000000000 ]---