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axboe@kernel.dk, hch@lst.de, kbusch@kernel.org, linux-kernel@vger.kernel.org, linux-nvme@lists.infradead.org, sagi@grimberg.me, syzkaller-bugs@googlegroups.com Content-Type: text/plain; charset="UTF-8" Hello, syzbot found the following issue on: HEAD commit: 2efb7a11f1aa Add linux-next specific files for 20261016 git tree: linux-next console+strace: https://syzkaller.appspot.com/x/log.txt?x=1419283c580000 kernel config: https://syzkaller.appspot.com/x/.config?x=129fca4e65ab9877 dashboard link: https://syzkaller.appspot.com/bug?extid=bdd7605037d64d5ccc10 compiler: Debian clang version 22.1.8 (1~deb13u4), Debian LLD 22.1.8 syz repro: https://syzkaller.appspot.com/x/repro.syz?x=1219283c580000 C reproducer: https://syzkaller.appspot.com/x/repro.c?x=1718d93e580000 Downloadable assets: disk image: https://storage.googleapis.com/syzbot-assets/cd996cff1b76/disk-2efb7a11.raw.xz vmlinux: https://storage.googleapis.com/syzbot-assets/59577d58bd5a/vmlinux-2efb7a11.xz kernel image: https://storage.googleapis.com/syzbot-assets/a3dfa3b04143/bzImage-2efb7a11.xz IMPORTANT: if you fix the issue, please add the following tag to the commit: Reported-by: syzbot+bdd7605037d64d5ccc10@syzkaller.appspotmail.com nvme nvme0: creating 2 I/O queues. nvme nvme0: mapped 2/0/0 default/read/poll queues. ------------[ cut here ]------------ DEBUG_LOCKS_WARN_ON(lock->magic != lock) WARNING: kernel/locking/mutex.c:625 at __mutex_lock_common kernel/locking/mutex.c:625 [inline], CPU#1: syz-executor121/5622 WARNING: kernel/locking/mutex.c:625 at __mutex_lock+0x132a/0x15a0 kernel/locking/mutex.c:821, CPU#1: syz-executor121/5622 Modules linked in: CPU: 1 UID: 0 PID: 5622 Comm: syz-executor121 Not tainted syzkaller #0 PREEMPT(full) Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/24/2026 RIP: 0010:__mutex_lock_common kernel/locking/mutex.c:625 [inline] RIP: 0010:__mutex_lock+0x1331/0x15a0 kernel/locking/mutex.c:821 Code: b9 7a 91 48 c1 e8 03 0f b6 04 18 84 c0 0f 85 46 02 00 00 83 3d 93 fc 83 05 00 75 13 48 8d 3d c6 fa 86 05 48 c7 c6 c0 27 0d 8c <67> 48 0f b9 3a 90 e9 1d ee ff ff 90 0f 0b 90 e9 f0 f1 ff ff 90 0f RSP: 0018:ffffc90003bdf1e0 EFLAGS: 00010246 RAX: 0000000000000000 RBX: dffffc0000000000 RCX: ffff88807e8a9f40 RDX: 0000000000000000 RSI: ffffffff8c0d27c0 RDI: ffffffff917db820 RBP: ffffc90003bdf378 R08: ffffffff917ab9e3 R09: 1ffffffff22f573c R10: dffffc0000000000 R11: fffffbfff22f573d R12: ffff88807ed84460 R13: 0000000000000000 R14: 1ffff9200077be50 R15: 0000000000000000 FS: 000055557669a400(0000) GS:ffff888123b8b000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007fcefd60ee9c CR3: 000000007ed68000 CR4: 00000000003526f0 Call Trace: nvme_tcp_init_request+0xbd/0x260 drivers/nvme/host/tcp.c:571 blk_mq_init_request block/blk-mq.c:3596 [inline] blk_mq_alloc_rqs block/blk-mq.c:3664 [inline] blk_mq_alloc_map_and_rqs+0x66d/0x980 block/blk-mq.c:4137 __blk_mq_alloc_map_and_rqs block/blk-mq.c:4155 [inline] __blk_mq_alloc_rq_maps block/blk-mq.c:4714 [inline] blk_mq_alloc_set_map_and_rqs+0x1a0/0x810 block/blk-mq.c:4745 blk_mq_alloc_tag_set+0x8e5/0x1000 block/blk-mq.c:4929 nvme_alloc_io_tag_set+0x36a/0x6f0 drivers/nvme/host/core.c:5103 nvme_tcp_configure_io_queues drivers/nvme/host/tcp.c:2297 [inline] nvme_tcp_setup_ctrl+0xc6f/0x1670 drivers/nvme/host/tcp.c:2530 nvme_tcp_create_ctrl+0xa59/0xf00 drivers/nvme/host/tcp.c:3123 nvmf_create_ctrl drivers/nvme/host/fabrics.c:1361 [inline] nvmf_dev_write+0x24ca/0x2d90 drivers/nvme/host/fabrics.c:1408 vfs_write+0x296/0xba0 fs/read_write.c:685 ksys_write+0x150/0x270 fs/read_write.c:1036 do_syscall_x64 arch/x86/entry/syscall_64.c:61 [inline] do_syscall_64+0x166/0x520 arch/x86/entry/syscall_64.c:84 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7f86ccedd849 Code: c0 79 93 eb d5 48 8d 7c 1d 00 eb 99 0f 1f 44 00 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 d8 ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007fffd35af4a8 EFLAGS: 00000246 ORIG_RAX: 0000000000000001 RAX: ffffffffffffffda RBX: 6769666e6f632f2e RCX: 00007f86ccedd849 RDX: 000000000000003a RSI: 00002000000007c0 RDI: 0000000000000008 RBP: 0000000000000001 R08: 0000000000000006 R09: 0000000000000006 R10: 0000000000000006 R11: 0000000000000246 R12: 00007fffd35af618 R13: 431bde82d7b634db R14: 00007f86ccf70c40 R15: 0000000000000002 ---------------- Code disassembly (best guess): 0: b9 7a 91 48 c1 mov $0xc148917a,%ecx 5: e8 03 0f b6 04 call 0x4b60f0d a: 18 84 c0 0f 85 46 02 sbb %al,0x246850f(%rax,%rax,8) 11: 00 00 add %al,(%rax) 13: 83 3d 93 fc 83 05 00 cmpl $0x0,0x583fc93(%rip) # 0x583fcad 1a: 75 13 jne 0x2f 1c: 48 8d 3d c6 fa 86 05 lea 0x586fac6(%rip),%rdi # 0x586fae9 23: 48 c7 c6 c0 27 0d 8c mov $0xffffffff8c0d27c0,%rsi * 2a: 67 48 0f b9 3a ud1 (%edx),%rdi <-- trapping instruction 2f: 90 nop 30: e9 1d ee ff ff jmp 0xffffee52 35: 90 nop 36: 0f 0b ud2 38: 90 nop 39: e9 f0 f1 ff ff jmp 0xfffff22e 3e: 90 nop 3f: 0f .byte 0xf --- 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@googlegroups.com. syzbot will keep track of this issue. See: https://goo.gl/tpsmEJ#status for how to communicate with syzbot. If the report is already addressed, let syzbot know by replying with: #syz fix: exact-commit-title If you want syzbot to run the reproducer, reply with: #syz test: git://repo/address.git branch-or-commit-hash If you attach or paste a git patch, syzbot will apply it before testing. If you want to overwrite report's subsystems, reply with: #syz set subsystems: new-subsystem (See the list of subsystem names on the web dashboard) If the report is a duplicate of another one, reply with: #syz dup: exact-subject-of-another-report If you want to undo deduplication, reply with: #syz undup