ci starts bisection 2023-03-27 11:59:37.113131259 +0000 UTC m=+11189.515087522 bisecting fixing commit since 2bca25eaeba6190efbfcb38ed169bd7ee43b5aaf building syzkaller on 267e3bb1576b2f9fa97ae49305aaaa80768ba385 ensuring issue is reproducible on original commit 2bca25eaeba6190efbfcb38ed169bd7ee43b5aaf testing commit 2bca25eaeba6190efbfcb38ed169bd7ee43b5aaf gcc compiler: gcc (Debian 10.2.1-6) 10.2.1 20210110, GNU ld (GNU Binutils for Debian) 2.35.2 kernel signature: 8e209f3b765edaa15d1ae9fc89ba43e7cf729d3433fe75e0799898b14f3c502c run #0: crashed: WARNING in kernfs_remove_by_name_ns run #1: crashed: WARNING in kernfs_remove_by_name_ns run #2: crashed: WARNING in kernfs_remove_by_name_ns run #3: crashed: general protection fault in blk_mq_free_rqs run #4: crashed: WARNING in kernfs_remove_by_name_ns run #5: crashed: WARNING in kernfs_remove_by_name_ns run #6: crashed: WARNING in kernfs_remove_by_name_ns run #7: crashed: WARNING in kernfs_remove_by_name_ns run #8: crashed: general protection fault in blk_mq_free_rqs run #9: crashed: general protection fault in blk_mq_free_rqs run #10: crashed: WARNING in kernfs_remove_by_name_ns run #11: crashed: WARNING in kernfs_remove_by_name_ns run #12: crashed: WARNING in kernfs_remove_by_name_ns run #13: crashed: WARNING in kernfs_remove_by_name_ns run #14: crashed: general protection fault in blk_mq_free_rqs run #15: crashed: WARNING in kernfs_remove_by_name_ns run #16: crashed: WARNING in kernfs_remove_by_name_ns run #17: crashed: general protection fault in blk_mq_free_rqs run #18: crashed: WARNING in kernfs_remove_by_name_ns run #19: crashed: general protection fault in blk_mq_free_rqs testing current HEAD 197b6b60ae7bc51dd0814953c562833143b292aa testing commit 197b6b60ae7bc51dd0814953c562833143b292aa gcc compiler: gcc (Debian 10.2.1-6) 10.2.1 20210110, GNU ld (GNU Binutils for Debian) 2.35.2 kernel signature: c6d68d6d4aeb85353885885dfa6806f5c360cde2633391b13acb35b148f01c16 run #0: basic kernel testing failed: BUG: program execution failed: executor NUM: exit status NUM run #1: crashed: WARNING in kernfs_remove_by_name_ns run #2: crashed: WARNING in kernfs_remove_by_name_ns run #3: crashed: WARNING in kernfs_remove_by_name_ns run #4: crashed: WARNING in kernfs_remove_by_name_ns run #5: crashed: WARNING in kernfs_remove_by_name_ns run #6: crashed: WARNING in kernfs_remove_by_name_ns run #7: crashed: WARNING in kernfs_remove_by_name_ns run #8: crashed: WARNING in kernfs_remove_by_name_ns run #9: crashed: WARNING in kernfs_remove_by_name_ns revisions tested: 2, total time: 24m30.546731025s (build: 14m51.730884241s, test: 8m57.206163822s) the crash still happens on HEAD commit msg: Linux 6.3-rc4 crash: WARNING in kernfs_remove_by_name_ns ------------[ cut here ]------------ kernfs: can not remove 'nr_tags', no directory WARNING: CPU: 0 PID: 6221 at fs/kernfs/dir.c:1648 kernfs_remove_by_name_ns+0xce/0xf0 fs/kernfs/dir.c:1648 Modules linked in: CPU: 0 PID: 6221 Comm: syz-executor.0 Not tainted 6.3.0-rc4-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 03/02/2023 RIP: 0010:kernfs_remove_by_name_ns+0xce/0xf0 fs/kernfs/dir.c:1648 Code: 08 c1 72 ff 31 c0 5b 5d 41 5c 41 5d 41 5e c3 4c 89 e7 e8 f5 c0 72 ff b8 fe ff ff ff eb e8 48 c7 c7 20 1a 1e 89 e8 b2 cf 5c ff <0f> 0b b8 fe ff ff ff eb d3 e8 a4 59 d1 ff eb 81 e8 9d 59 d1 ff e9 RSP: 0018:ffffc9000339fa68 EFLAGS: 00010286 RAX: 0000000000000000 RBX: ffffffff8ba5a868 RCX: 0000000000000000 RDX: 0000000000000002 RSI: 0000000000000008 RDI: 0000000000000001 RBP: ffffffff8ba5a960 R08: 0000000000000000 R09: ffffc9000339f797 R10: fffff52000673ef2 R11: 0000000000000000 R12: 0000000000000000 R13: dffffc0000000000 R14: ffffffff8963a4e0 R15: ffff88801d220000 FS: 00007f6418678700(0000) GS:ffff8880b9c00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007f6418678718 CR3: 000000002056c000 CR4: 00000000003506f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: kernfs_remove_by_name include/linux/kernfs.h:618 [inline] remove_files+0x87/0x1a0 fs/sysfs/group.c:28 sysfs_remove_group+0x72/0x140 fs/sysfs/group.c:288 sysfs_remove_groups fs/sysfs/group.c:312 [inline] sysfs_remove_groups+0x4a/0x90 fs/sysfs/group.c:304 __kobject_del+0x7d/0x1c0 lib/kobject.c:587 kobject_del lib/kobject.c:619 [inline] kobject_del+0x32/0x50 lib/kobject.c:611 blk_mq_unregister_hctx block/blk-mq-sysfs.c:157 [inline] blk_mq_unregister_hctx block/blk-mq-sysfs.c:146 [inline] blk_mq_sysfs_unregister_hctxs+0x1f6/0x270 block/blk-mq-sysfs.c:285 __blk_mq_update_nr_hw_queues block/blk-mq.c:4709 [inline] blk_mq_update_nr_hw_queues+0x3f8/0xee0 block/blk-mq.c:4753 nbd_start_device+0x10a/0xc20 drivers/block/nbd.c:1356 nbd_start_device_ioctl drivers/block/nbd.c:1406 [inline] __nbd_ioctl drivers/block/nbd.c:1482 [inline] nbd_ioctl+0x3df/0xa60 drivers/block/nbd.c:1522 blkdev_ioctl+0x2ff/0x6c0 block/ioctl.c:615 vfs_ioctl fs/ioctl.c:51 [inline] __do_sys_ioctl fs/ioctl.c:870 [inline] __se_sys_ioctl fs/ioctl.c:856 [inline] __x64_sys_ioctl+0x11f/0x190 fs/ioctl.c:856 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x35/0xb0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x63/0xcd RIP: 0033:0x7f641748a5a9 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 b8 ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007f6418678168 EFLAGS: 00000246 ORIG_RAX: 0000000000000010 RAX: ffffffffffffffda RBX: 00007f64175ac050 RCX: 00007f641748a5a9 RDX: 0000000000000000 RSI: 000000000000ab03 RDI: 0000000000000007 RBP: 00007f64186781d0 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000002 R13: 00007ffc80595f0f R14: 00007f6418678300 R15: 0000000000022000