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WARNING in kernfs_remove_by_name_ns

Status: upstream: reported C repro on 2023/08/11 09:03
Bug presence: origin:lts-only
[Documentation on labels]
Reported-by: syzbot+f8b033741300b198ef31@syzkaller.appspotmail.com
First crash: 491d, last: 71d
Fix bisection: failed (error log, bisect log)
  
▶ ▼ Bug presence (2)
Date Name Commit Repro Result
2023/08/11 linux-5.15.y (ToT) 24c4de4069cb C [report] WARNING in kernfs_remove_by_name_ns
2023/08/11 upstream (ToT) 25aa0bebba72 C Didn't crash
▶ ▼ Similar bugs (4)
Kernel Title Repro Cause bisect Fix bisect Count Last Reported Patched Status
linux-6.1 WARNING in kernfs_remove_by_name_ns origin:upstream C 15 44d 636d 0/3 upstream: reported C repro on 2023/03/18 18:13
upstream WARNING in kernfs_remove_by_name_ns (2) kernfs 1 1307d 1303d 0/28 auto-closed as invalid on 2021/09/14 07:04
upstream WARNING in kernfs_remove_by_name_ns (3) kernfs C error 300 2d09h 1132d 0/28 upstream: reported C repro on 2021/11/08 11:24
upstream WARNING in kernfs_remove_by_name_ns kernfs 4 1926d 2000d 0/28 auto-closed as invalid on 2020/01/04 08:56
▶ ▼ Last patch testing requests (2)
Created Duration User Patch Repo Result
2024/10/04 11:48 14m retest repro linux-5.15.y report log
2024/10/04 11:48 14m retest repro linux-5.15.y report log
▶ ▼ Fix bisection attempts (9)
Created Duration User Patch Repo Result
2024/10/14 08:18 1m fix candidate upstream error job log
2024/08/21 19:22 0m fix candidate upstream error job log
2024/07/16 20:33 50m fix candidate upstream error job log
2024/05/21 11:18 0m fix candidate upstream error job log
2024/04/18 18:47 1m fix candidate upstream error job log
2024/03/06 12:21 1m fix candidate upstream error job log
2023/12/18 12:31 0m fix candidate upstream error job log
2023/11/15 22:19 7m fix candidate upstream error job log
2023/10/25 04:30 0m bisect fix linux-5.15.y error job log

Sample crash report:
------------[ cut here ]------------
kernfs: can not remove 'nr_tags', no directory
WARNING: CPU: 1 PID: 4766 at fs/kernfs/dir.c:1545 kernfs_remove_by_name_ns+0xd0/0x158
Modules linked in:
CPU: 1 PID: 4766 Comm: syz-executor107 Not tainted 5.15.148-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 11/17/2023
pstate: 60400005 (nZCv daif +PAN -UAO -TCO -DIT -SSBS BTYPE=--)
pc : kernfs_remove_by_name_ns+0xd0/0x158
lr : kernfs_remove_by_name_ns+0xcc/0x158 fs/kernfs/dir.c:1544
sp : ffff80001da97760
x29: ffff80001da97760 x28: ffff0000cc2a9000 x27: ffff0000cc245a00
x26: 0000000000000000 x25: ffff8000150a7748
 x24: 1ffff000023ed628

x23: dfff800000000000
 x22: ffff8000150a7780
 x21: 0000000000000000

x20: 0000000000000000
 x19: 00000000fffffffe
 x18: 0000000000000000

x17: 0000000000000000
 x16: ffff80001198323c
 x15: 0000000000000063

x14: 1ffff0000292406a
 x13: dfff800000000000
 x12: 0000000000000001

x11: 0000000000000000
 x10: 0000000000000000
 x9 : 0c61684c74cc4400

x8 : 0c61684c74cc4400
 x7 : 0000000000000000
 x6 : 0000000000000000
x5 : 0000000000000080 x4 : 0000000000000000 x3 : ffff80000854d610
x2 : 0000000000000001 x1 : 0000000100000000 x0 : 000000000000002e
Call trace:
 kernfs_remove_by_name_ns+0xd0/0x158
 kernfs_remove_by_name include/linux/kernfs.h:598 [inline]
 remove_files fs/sysfs/group.c:28 [inline]
 sysfs_remove_group+0xf8/0x288 fs/sysfs/group.c:289
 sysfs_remove_groups+0x5c/0xb4 fs/sysfs/group.c:313
 __kobject_del+0x90/0x2d4 lib/kobject.c:619
 kobject_del+0x48/0x68 lib/kobject.c:651
 blk_mq_unregister_hctx block/blk-mq-sysfs.c:183 [inline]
 blk_mq_sysfs_unregister+0x1a0/0x274 block/blk-mq-sysfs.c:309
 __blk_mq_update_nr_hw_queues block/blk-mq.c:3764 [inline]
 blk_mq_update_nr_hw_queues+0x504/0xc58 block/blk-mq.c:3804
 nbd_start_device+0x158/0xb34 drivers/block/nbd.c:1301
 nbd_start_device_ioctl drivers/block/nbd.c:1351 [inline]
 __nbd_ioctl drivers/block/nbd.c:1427 [inline]
 nbd_ioctl+0x420/0xc2c drivers/block/nbd.c:1467
 blkdev_ioctl+0x3d8/0xbd0 block/ioctl.c:606
 block_ioctl+0xa8/0x114 block/fops.c:493
 vfs_ioctl fs/ioctl.c:51 [inline]
 __do_sys_ioctl fs/ioctl.c:874 [inline]
 __se_sys_ioctl fs/ioctl.c:860 [inline]
 __arm64_sys_ioctl+0x14c/0x1c8 fs/ioctl.c:860
 __invoke_syscall arch/arm64/kernel/syscall.c:38 [inline]
 invoke_syscall+0x98/0x2b8 arch/arm64/kernel/syscall.c:52
 el0_svc_common+0x138/0x258 arch/arm64/kernel/syscall.c:142
 do_el0_svc+0x58/0x14c arch/arm64/kernel/syscall.c:181
 el0_svc+0x7c/0x1f0 arch/arm64/kernel/entry-common.c:608
 el0t_64_sync_handler+0x84/0xe4 arch/arm64/kernel/entry-common.c:626
 el0t_64_sync+0x1a0/0x1a4 arch/arm64/kernel/entry.S:584
irq event stamp: 2118
hardirqs last  enabled at (2117): [<ffff800008327ef0>] console_trylock_spinning+0x180/0x280 kernel/printk/printk.c:1891
hardirqs last disabled at (2118): [<ffff80001197e8c8>] el1_dbg+0x24/0x80 arch/arm64/kernel/entry-common.c:396
softirqs last  enabled at (458): [<ffff8000080300b4>] local_bh_enable+0x10/0x34 include/linux/bottom_half.h:31
softirqs last disabled at (456): [<ffff800008030080>] local_bh_disable+0x10/0x34 include/linux/bottom_half.h:18
---[ end trace c997b5f576d326f3 ]---
------------[ cut here ]------------
kernfs: can not remove 'nr_reserved_tags', no directory
WARNING: CPU: 0 PID: 4766 at fs/kernfs/dir.c:1545 kernfs_remove_by_name_ns+0xd0/0x158
Modules linked in:
CPU: 0 PID: 4766 Comm: syz-executor107 Tainted: G        W         5.15.148-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 11/17/2023
pstate: 60400005 (nZCv daif +PAN -UAO -TCO -DIT -SSBS BTYPE=--)
pc : kernfs_remove_by_name_ns+0xd0/0x158
lr : kernfs_remove_by_name_ns+0xcc/0x158 fs/kernfs/dir.c:1544
sp : ffff80001da97760
x29: ffff80001da97760 x28: ffff0000cc2a9000 x27: ffff0000cc245a00
x26: 0000000000000000 x25: ffff8000150a7750 x24: 1ffff000023ed628
x23: dfff800000000000 x22: ffff8000150a77e0 x21: 0000000000000000
x20: 0000000000000000 x19: 00000000fffffffe x18: 0000000000000001
x17: 0000000000000000 x16: ffff80001198323c x15: 00000000ffffffff
x14: ffff0000cffeb680 x13: fffffffffffd6b10 x12: 0000000000000001
x11: 0000000000000000 x10: 0000000000000000 x9 : 0c61684c74cc4400
x8 : 0c61684c74cc4400 x7 : fffffffffffd6b10 x6 : fffffffffffd6af0
x5 : ffff80001da96ed8 x4 : ffff8000149d8130 x3 : ffff80000854d610
x2 : 0000000000000001 x1 : 0000000100000000 x0 : 0000000000000037
Call trace:
 kernfs_remove_by_name_ns+0xd0/0x158
 kernfs_remove_by_name include/linux/kernfs.h:598 [inline]
 remove_files fs/sysfs/group.c:28 [inline]
 sysfs_remove_group+0xf8/0x288 fs/sysfs/group.c:289
 sysfs_remove_groups+0x5c/0xb4 fs/sysfs/group.c:313
 __kobject_del+0x90/0x2d4 lib/kobject.c:619
 kobject_del+0x48/0x68 lib/kobject.c:651
 blk_mq_unregister_hctx block/blk-mq-sysfs.c:183 [inline]
 blk_mq_sysfs_unregister+0x1a0/0x274 block/blk-mq-sysfs.c:309
 __blk_mq_update_nr_hw_queues block/blk-mq.c:3764 [inline]
 blk_mq_update_nr_hw_queues+0x504/0xc58 block/blk-mq.c:3804
 nbd_start_device+0x158/0xb34 drivers/block/nbd.c:1301
 nbd_start_device_ioctl drivers/block/nbd.c:1351 [inline]
 __nbd_ioctl drivers/block/nbd.c:1427 [inline]
 nbd_ioctl+0x420/0xc2c drivers/block/nbd.c:1467
 blkdev_ioctl+0x3d8/0xbd0 block/ioctl.c:606
 block_ioctl+0xa8/0x114 block/fops.c:493
 vfs_ioctl fs/ioctl.c:51 [inline]
 __do_sys_ioctl fs/ioctl.c:874 [inline]
 __se_sys_ioctl fs/ioctl.c:860 [inline]
 __arm64_sys_ioctl+0x14c/0x1c8 fs/ioctl.c:860
 __invoke_syscall arch/arm64/kernel/syscall.c:38 [inline]
 invoke_syscall+0x98/0x2b8 arch/arm64/kernel/syscall.c:52
 el0_svc_common+0x138/0x258 arch/arm64/kernel/syscall.c:142
 do_el0_svc+0x58/0x14c arch/arm64/kernel/syscall.c:181
 el0_svc+0x7c/0x1f0 arch/arm64/kernel/entry-common.c:608
 el0t_64_sync_handler+0x84/0xe4 arch/arm64/kernel/entry-common.c:626
 el0t_64_sync+0x1a0/0x1a4 arch/arm64/kernel/entry.S:584
irq event stamp: 2306
hardirqs last  enabled at (2305): [<ffff800008329e94>] __up_console_sem+0xb4/0x100 kernel/printk/printk.c:257
hardirqs last disabled at (2306): [<ffff80001197e8c8>] el1_dbg+0x24/0x80 arch/arm64/kernel/entry-common.c:396
softirqs last  enabled at (2302): [<ffff800008020ccc>] softirq_handle_end kernel/softirq.c:401 [inline]
softirqs last  enabled at (2302): [<ffff800008020ccc>] __do_softirq+0xb5c/0xdb0 kernel/softirq.c:587
softirqs last disabled at (2257): [<ffff8000081b5568>] do_softirq_own_stack include/asm-generic/softirq_stack.h:10 [inline]
softirqs last disabled at (2257): [<ffff8000081b5568>] invoke_softirq kernel/softirq.c:439 [inline]
softirqs last disabled at (2257): [<ffff8000081b5568>] __irq_exit_rcu+0x264/0x4d4 kernel/softirq.c:637
---[ end trace c997b5f576d326f4 ]---
------------[ cut here ]------------
kernfs: can not remove 'cpu_list', no directory
WARNING: CPU: 0 PID: 4766 at fs/kernfs/dir.c:1545 kernfs_remove_by_name_ns+0xd0/0x158
Modules linked in:
CPU: 0 PID: 4766 Comm: syz-executor107 Tainted: G        W         5.15.148-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 11/17/2023
pstate: 60400005 (nZCv daif +PAN -UAO -TCO -DIT -SSBS BTYPE=--)
pc : kernfs_remove_by_name_ns+0xd0/0x158
lr : kernfs_remove_by_name_ns+0xcc/0x158 fs/kernfs/dir.c:1544
sp : ffff80001da97760
x29: ffff80001da97760 x28: ffff0000cc2a9000 x27: ffff0000cc245a00
x26: 0000000000000000 x25: ffff8000150a7758 x24: 1ffff000023ed628
x23: dfff800000000000 x22: ffff8000150a7840 x21: 0000000000000000
x20: 0000000000000000 x19: 00000000fffffffe x18: 0000000000000001
x17: 0000000000000000 x16: ffff80001198323c x15: 00000000ffffffff
x14: ffff0000cffeb680 x13: fffffffffffd7470 x12: 0000000000000001
x11: 0000000000000000 x10: 0000000000000000 x9 : 0c61684c74cc4400
x8 : 0c61684c74cc4400 x7 : fffffffffffd7470 x6 : fffffffffffd7450
x5 : ffff80001da96ed8 x4 : ffff8000149d8568 x3 : ffff80000854d610
x2 : 0000000000000001 x1 : 0000000100000000 x0 : 000000000000002f
Call trace:
 kernfs_remove_by_name_ns+0xd0/0x158
 kernfs_remove_by_name include/linux/kernfs.h:598 [inline]
 remove_files fs/sysfs/group.c:28 [inline]
 sysfs_remove_group+0xf8/0x288 fs/sysfs/group.c:289
 sysfs_remove_groups+0x5c/0xb4 fs/sysfs/group.c:313
 __kobject_del+0x90/0x2d4 lib/kobject.c:619
 kobject_del+0x48/0x68 lib/kobject.c:651
 blk_mq_unregister_hctx block/blk-mq-sysfs.c:183 [inline]
 blk_mq_sysfs_unregister+0x1a0/0x274 block/blk-mq-sysfs.c:309
 __blk_mq_update_nr_hw_queues block/blk-mq.c:3764 [inline]
 blk_mq_update_nr_hw_queues+0x504/0xc58 block/blk-mq.c:3804
 nbd_start_device+0x158/0xb34 drivers/block/nbd.c:1301
 nbd_start_device_ioctl drivers/block/nbd.c:1351 [inline]
 __nbd_ioctl drivers/block/nbd.c:1427 [inline]
 nbd_ioctl+0x420/0xc2c drivers/block/nbd.c:1467
 blkdev_ioctl+0x3d8/0xbd0 block/ioctl.c:606
 block_ioctl+0xa8/0x114 block/fops.c:493
 vfs_ioctl fs/ioctl.c:51 [inline]
 __do_sys_ioctl fs/ioctl.c:874 [inline]
 __se_sys_ioctl fs/ioctl.c:860 [inline]
 __arm64_sys_ioctl+0x14c/0x1c8 fs/ioctl.c:860
 __invoke_syscall arch/arm64/kernel/syscall.c:38 [inline]
 invoke_syscall+0x98/0x2b8 arch/arm64/kernel/syscall.c:52
 el0_svc_common+0x138/0x258 arch/arm64/kernel/syscall.c:142
 do_el0_svc+0x58/0x14c arch/arm64/kernel/syscall.c:181
 el0_svc+0x7c/0x1f0 arch/arm64/kernel/entry-common.c:608
 el0t_64_sync_handler+0x84/0xe4 arch/arm64/kernel/entry-common.c:626
 el0t_64_sync+0x1a0/0x1a4 arch/arm64/kernel/entry.S:584
irq event stamp: 2542
hardirqs last  enabled at (2541): [<ffff800008329e94>] __up_console_sem+0xb4/0x100 kernel/printk/printk.c:257
hardirqs last disabled at (2542): [<ffff80001197e8c8>] el1_dbg+0x24/0x80 arch/arm64/kernel/entry-common.c:396
softirqs last  enabled at (2518): [<ffff800008020ccc>] softirq_handle_end kernel/softirq.c:401 [inline]
softirqs last  enabled at (2518): [<ffff800008020ccc>] __do_softirq+0xb5c/0xdb0 kernel/softirq.c:587
softirqs last disabled at (2309): [<ffff8000081b5568>] do_softirq_own_stack include/asm-generic/softirq_stack.h:10 [inline]
softirqs last disabled at (2309): [<ffff8000081b5568>] invoke_softirq kernel/softirq.c:439 [inline]
softirqs last disabled at (2309): [<ffff8000081b5568>] __irq_exit_rcu+0x264/0x4d4 kernel/softirq.c:637
---[ end trace c997b5f576d326f5 ]---
FAULT_INJECTION: forcing a failure.
name failslab, interval 1, probability 0, space 0, times 0
CPU: 0 PID: 4766 Comm: syz-executor107 Tainted: G        W         5.15.148-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 11/17/2023
Call trace:
 dump_backtrace+0x0/0x530 arch/arm64/kernel/stacktrace.c:152
 show_stack+0x2c/0x3c arch/arm64/kernel/stacktrace.c:216
 __dump_stack lib/dump_stack.c:88 [inline]
 dump_stack_lvl+0x108/0x170 lib/dump_stack.c:106
 dump_stack+0x1c/0x58 lib/dump_stack.c:113
 fail_dump lib/fault-inject.c:52 [inline]
 should_fail+0x3b8/0x514 lib/fault-inject.c:146
 __should_failslab+0xbc/0x110 mm/failslab.c:33
 should_failslab+0x10/0x28 mm/slab_common.c:1337
 slab_pre_alloc_hook+0x64/0xe8 mm/slab.h:494
 slab_alloc_node mm/slub.c:3134 [inline]
 __kmalloc_node+0xbc/0x5b8 mm/slub.c:4451
 kmalloc_array_node include/linux/slab.h:684 [inline]
 kcalloc_node include/linux/slab.h:689 [inline]
 blk_mq_realloc_hw_ctxs+0xc4/0x12ec block/blk-mq.c:3208
 __blk_mq_update_nr_hw_queues block/blk-mq.c:3776 [inline]
 blk_mq_update_nr_hw_queues+0x68c/0xc58 block/blk-mq.c:3804
 nbd_start_device+0x158/0xb34 drivers/block/nbd.c:1301
 nbd_start_device_ioctl drivers/block/nbd.c:1351 [inline]
 __nbd_ioctl drivers/block/nbd.c:1427 [inline]
 nbd_ioctl+0x420/0xc2c drivers/block/nbd.c:1467
 blkdev_ioctl+0x3d8/0xbd0 block/ioctl.c:606
 block_ioctl+0xa8/0x114 block/fops.c:493
 vfs_ioctl fs/ioctl.c:51 [inline]
 __do_sys_ioctl fs/ioctl.c:874 [inline]
 __se_sys_ioctl fs/ioctl.c:860 [inline]
 __arm64_sys_ioctl+0x14c/0x1c8 fs/ioctl.c:860
 __invoke_syscall arch/arm64/kernel/syscall.c:38 [inline]
 invoke_syscall+0x98/0x2b8 arch/arm64/kernel/syscall.c:52
 el0_svc_common+0x138/0x258 arch/arm64/kernel/syscall.c:142
 do_el0_svc+0x58/0x14c arch/arm64/kernel/syscall.c:181
 el0_svc+0x7c/0x1f0 arch/arm64/kernel/entry-common.c:608
 el0t_64_sync_handler+0x84/0xe4 arch/arm64/kernel/entry-common.c:626
 el0t_64_sync+0x1a0/0x1a4 arch/arm64/kernel/entry.S:584
Increasing nr_hw_queues to 2 fails, fallback to 1

Crashes (6):
Time Kernel Commit Syzkaller Config Log Report Syz repro C repro VM info Assets (help?) Manager Title
2024/02/15 23:45 linux-5.15.y 6139f2a02fe0 fd39cf6f .config console log report syz C [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan-arm64 WARNING in kernfs_remove_by_name_ns
2023/08/11 11:15 linux-5.15.y c275eaaaa342 da3c3ef8 .config console log report syz C [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan-arm64 WARNING in kernfs_remove_by_name_ns
2023/09/24 23:16 linux-5.15.y b911329317b4 0b6a67ac .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan WARNING in kernfs_remove_by_name_ns
2024/03/09 15:46 linux-5.15.y 574362648507 6ee49f2e .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan-arm64 WARNING in kernfs_remove_by_name_ns
2024/02/15 21:29 linux-5.15.y 6139f2a02fe0 fd39cf6f .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan-arm64 WARNING in kernfs_remove_by_name_ns
2023/08/11 09:03 linux-5.15.y c275eaaaa342 da3c3ef8 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan-arm64 WARNING in kernfs_remove_by_name_ns
* Struck through repros no longer work on HEAD.