Since linux next-20240902 starting debian sid on my MSI Alpha 15 Laptop hangs
before the GUI is enabled. After rebooting into a working kernel (v6.11-rc6)
the following messages can be found in /var/log/kern.log:
2024-09-02T11:15:06.501185+02:00 lisa kernel: [ C4] rcu: INFO: rcu_preempt self-detected stall on CPU
2024-09-02T11:15:06.501190+02:00 lisa kernel: [ C4] rcu: 4-....: (20994 ticks this GP) idle=2214/1/0x4000000000000000 softirq=968/968 fqs=4561
2024-09-02T11:15:06.501192+02:00 lisa kernel: [ C4] rcu: (t=21001 jiffies g=993 q=8719 ncpus=16)
2024-09-02T11:15:06.501193+02:00 lisa kernel: [ C4] CPU: 4 UID: 0 PID: 1282 Comm: fusermount3 Not tainted 6.11.0-rc6-next-20240902-master #366
2024-09-02T11:15:06.501196+02:00 lisa kernel: [ C4] Hardware name: Micro-Star International Co., Ltd. Alpha 15 B5EEK/MS-158L, BIOS E158LAMS.107 11/10/2021
2024-09-02T11:15:06.501198+02:00 lisa kernel: [ C4] RIP: 0010:queued_spin_lock_slowpath+0x43/0x1b0
2024-09-02T11:15:06.501201+02:00 lisa kernel: [ C4] Code: ba 2a 08 0f 92 c1 8b 02 0f b6 c9 c1 e1 08 30 e4 09 c8 3d ff 00 00 00 0f 87 e9 00 00 00 85 c0 74 10 0f b6 02 84 c0 74 09 f3 90 <0f> b6 02 84 c0 75 f7 b8 01 00 00 00 66 89 02 e9 54 dd 1d 00 8b 37
2024-09-02T11:15:06.501203+02:00 lisa kernel: [ C4] RSP: 0018:ffffb64a45267d08 EFLAGS: 00000202
2024-09-02T11:15:06.501206+02:00 lisa kernel: [ C4] RAX: 0000000000000001 RBX: ffff9f0cd1187a38 RCX: 0000000000000000
2024-09-02T11:15:06.501208+02:00 lisa kernel: [ C4] RDX: ffff9f0cd1187a38 RSI: 0000000000000001 RDI: ffff9f0cd1187a38
2024-09-02T11:15:06.501210+02:00 lisa kernel: [ C4] RBP: 0000000000000000 R08: 0000000000000001 R09: ffffffff8b0261c8
2024-09-02T11:15:06.501211+02:00 lisa kernel: [ C4] R10: 0000000000000001 R11: 0000000000000005 R12: ffffb64a45267d58
2024-09-02T11:15:06.501213+02:00 lisa kernel: [ C4] R13: ffff9f0cd1187700 R14: 0000000000000000 R15: ffff9f0c89b73c00
2024-09-02T11:15:06.501215+02:00 lisa kernel: [ C4] FS: 00007fde155f0740(0000) GS:ffff9f1b2e700000(0000) knlGS:0000000000000000
2024-09-02T11:15:06.501234+02:00 lisa kernel: [ C4] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
2024-09-02T11:15:06.501236+02:00 lisa kernel: [ C4] CR2: 00007fde157327b0 CR3: 000000018167a000 CR4: 0000000000750ef0
2024-09-02T11:15:06.501238+02:00 lisa kernel: [ C4] PKRU: 55555554
2024-09-02T11:15:06.501239+02:00 lisa kernel: [ C4] Call Trace:
2024-09-02T11:15:06.501252+02:00 lisa kernel: [ C4] <IRQ>
2024-09-02T11:15:06.501254+02:00 lisa kernel: [ C4] ? rcu_dump_cpu_stacks+0xd6/0x100
2024-09-02T11:15:06.501256+02:00 lisa kernel: [ C4] ? rcu_sched_clock_irq+0x31d/0xb20
2024-09-02T11:15:06.501259+02:00 lisa kernel: [ C4] ? srso_alias_return_thunk+0x5/0xfbef5
2024-09-02T11:15:06.501260+02:00 lisa kernel: [ C4] ? update_load_avg+0x77/0x6b0
2024-09-02T11:15:06.501261+02:00 lisa kernel: [ C4] ? srso_alias_return_thunk+0x5/0xfbef5
2024-09-02T11:15:06.501263+02:00 lisa kernel: [ C4] ? update_process_times+0x69/0xa0
2024-09-02T11:15:06.501264+02:00 lisa kernel: [ C4] ? tick_nohz_handler+0x8a/0x140
2024-09-02T11:15:06.501266+02:00 lisa kernel: [ C4] ? tick_do_update_jiffies64+0xd0/0xd0
2024-09-02T11:15:06.501268+02:00 lisa kernel: [ C4] ? __hrtimer_run_queues+0x110/0x1a0
2024-09-02T11:15:06.501270+02:00 lisa kernel: [ C4] ? hrtimer_interrupt+0xf5/0x210
2024-09-02T11:15:06.501272+02:00 lisa kernel: [ C4] ? __sysvec_apic_timer_interrupt+0x4e/0x60
2024-09-02T11:15:06.501274+02:00 lisa kernel: [ C4] ? sysvec_apic_timer_interrupt+0x64/0x80
2024-09-02T11:15:06.501275+02:00 lisa kernel: [ C4] </IRQ>
2024-09-02T11:15:06.501277+02:00 lisa kernel: [ C4] <TASK>
2024-09-02T11:15:06.501279+02:00 lisa kernel: [ C4] ? asm_sysvec_apic_timer_interrupt+0x1a/0x20
2024-09-02T11:15:06.501280+02:00 lisa kernel: [ C4] ? queued_spin_lock_slowpath+0x43/0x1b0
2024-09-02T11:15:06.501283+02:00 lisa kernel: [ C4] ? srso_alias_return_thunk+0x5/0xfbef5
2024-09-02T11:15:06.501284+02:00 lisa kernel: [ C4] ? fuse_iget+0x11c/0x250 [fuse]
2024-09-02T11:15:06.501286+02:00 lisa kernel: [ C4] ? fuse_fill_super_common+0x362/0x480 [fuse]
2024-09-02T11:15:06.501288+02:00 lisa kernel: [ C4] ? fuse_fill_super_common+0x480/0x480 [fuse]
2024-09-02T11:15:06.501291+02:00 lisa kernel: [ C4] ? fuse_fill_super+0x54/0x90 [fuse]
2024-09-02T11:15:06.501293+02:00 lisa kernel: [ C4] ? get_tree_nodev+0x64/0x90
2024-09-02T11:15:06.501294+02:00 lisa kernel: [ C4] ? fget+0x75/0xb0
2024-09-02T11:15:06.501297+02:00 lisa kernel: [ C4] ? fuse_get_tree+0xbd/0x190 [fuse]
2024-09-02T11:15:06.501298+02:00 lisa kernel: [ C4] ? vfs_get_tree+0x24/0xd0
2024-09-02T11:15:06.501300+02:00 lisa kernel: [ C4] ? srso_alias_return_thunk+0x5/0xfbef5
2024-09-02T11:15:06.501302+02:00 lisa kernel: [ C4] ? path_mount+0x472/0xab0
2024-09-02T11:15:06.501303+02:00 lisa kernel: [ C4] ? __x64_sys_mount+0x103/0x140
2024-09-02T11:15:06.501305+02:00 lisa kernel: [ C4] ? do_syscall_64+0x5f/0x170
2024-09-02T11:15:06.501308+02:00 lisa kernel: [ C4] ? entry_SYSCALL_64_after_hwframe+0x55/0x5d
2024-09-02T11:15:06.501310+02:00 lisa kernel: [ C4] </TASK>
[..]
2024-09-02T11:15:32.315047+02:00 lisa kernel: [ C4] watchdog: BUG: soft lockup - CPU#4 stuck for 45s! [fusermount3:1282]
2024-09-02T11:15:32.315052+02:00 lisa kernel: [ C4] Modules linked in: snd_seq_dummy snd_hrtimer snd_seq_midi snd_seq_midi_event snd_rawmidi snd_seq snd_seq_device rfcomm cpufreq_userspace cpufreq_powersave cpufreq_conservative bnep nls_ascii nls_cp437 vfat fat snd_ctl_led snd_hda_codec_realtek snd_hda_codec_generic snd_hda_scodec_component snd_hda_codec_hdmi snd_hda_intel snd_intel_dspcfg btusb snd_hda_codec snd_soc_dmic snd_acp3x_rn snd_acp3x_pdm_dma uvcvideo btrtl snd_hwdep videobuf2_vmalloc snd_soc_core btintel uvc snd_hda_core videobuf2_memops btbcm snd_pcm_oss videobuf2_v4l2 btmtk snd_mixer_oss videodev snd_pcm bluetooth snd_rn_pci_acp3x snd_acp_config snd_timer videobuf2_common snd_soc_acpi msi_wmi ecdh_generic amd_atl ecc mc sparse_keymap edac_mce_amd wmi_bmof snd k10temp snd_pci_acp3x ac soundcore ccp battery hid_sensor_accel_3d hid_sensor_gyro_3d hid_sensor_magn_3d hid_sensor_als hid_sensor_prox button hid_sensor_trigger industrialio_triggered_buffer kfifo_buf amd_pmc industrialio hid_sensor_iio_common evdev joydev serio_raw mt7921e mt7921_common
2024-09-02T11:15:32.315056+02:00 lisa kernel: [ C4] mt792x_lib mt76_connac_lib mt76 mac80211 libarc4 cfg80211 rfkill msr nvme_fabrics fuse efi_pstore configfs efivarfs autofs4 ext4 crc32c_generic mbcache jbd2 usbhid amdgpu i2c_algo_bit drm_ttm_helper ttm xhci_pci drm_exec drm_suballoc_helper amdxcp xhci_hcd drm_buddy gpu_sched hid_sensor_hub usbcore nvme drm_display_helper mfd_core i2c_piix4 hid_multitouch hid_generic crc32c_intel psmouse amd_sfh i2c_smbus usb_common nvme_core crc16 r8169 i2c_hid_acpi i2c_hid hid i2c_designware_platform i2c_designware_core
2024-09-02T11:15:32.315059+02:00 lisa kernel: [ C4] CPU: 4 UID: 0 PID: 1282 Comm: fusermount3 Not tainted 6.11.0-rc6-next-20240902-master #366
2024-09-02T11:15:32.315061+02:00 lisa kernel: [ C4] Hardware name: Micro-Star International Co., Ltd. Alpha 15 B5EEK/MS-158L, BIOS E158LAMS.107 11/10/2021
2024-09-02T11:15:32.315063+02:00 lisa kernel: [ C4] RIP: 0010:queued_spin_lock_slowpath+0x46/0x1b0
2024-09-02T11:15:32.315065+02:00 lisa kernel: [ C4] Code: 0f 92 c1 8b 02 0f b6 c9 c1 e1 08 30 e4 09 c8 3d ff 00 00 00 0f 87 e9 00 00 00 85 c0 74 10 0f b6 02 84 c0 74 09 f3 90 0f b6 02 <84> c0 75 f7 b8 01 00 00 00 66 89 02 e9 54 dd 1d 00 8b 37 b8 00 02
2024-09-02T11:15:32.315068+02:00 lisa kernel: [ C4] RSP: 0018:ffffb64a45267d08 EFLAGS: 00000202
2024-09-02T11:15:32.315070+02:00 lisa kernel: [ C4] RAX: 0000000000000001 RBX: ffff9f0cd1187a38 RCX: 0000000000000000
2024-09-02T11:15:32.315072+02:00 lisa kernel: [ C4] RDX: ffff9f0cd1187a38 RSI: 0000000000000001 RDI: ffff9f0cd1187a38
2024-09-02T11:15:32.315074+02:00 lisa kernel: [ C4] RBP: 0000000000000000 R08: 0000000000000001 R09: ffffffff8b0261c8
2024-09-02T11:15:32.315076+02:00 lisa kernel: [ C4] R10: 0000000000000001 R11: 0000000000000005 R12: ffffb64a45267d58
2024-09-02T11:15:32.315077+02:00 lisa kernel: [ C4] R13: ffff9f0cd1187700 R14: 0000000000000000 R15: ffff9f0c89b73c00
2024-09-02T11:15:32.315080+02:00 lisa kernel: [ C4] FS: 00007fde155f0740(0000) GS:ffff9f1b2e700000(0000) knlGS:0000000000000000
2024-09-02T11:15:32.315082+02:00 lisa kernel: [ C4] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
2024-09-02T11:15:32.315084+02:00 lisa kernel: [ C4] CR2: 00007fde157327b0 CR3: 000000018167a000 CR4: 0000000000750ef0
2024-09-02T11:15:32.315086+02:00 lisa kernel: [ C4] PKRU: 55555554
2024-09-02T11:15:32.315088+02:00 lisa kernel: [ C4] Call Trace:
2024-09-02T11:15:32.315090+02:00 lisa kernel: [ C4] <IRQ>
2024-09-02T11:15:32.315092+02:00 lisa kernel: [ C4] ? watchdog_timer_fn.cold+0x3d/0x9c
2024-09-02T11:15:32.315094+02:00 lisa kernel: [ C4] ? softlockup_fn+0x50/0x50
2024-09-02T11:15:32.315097+02:00 lisa kernel: [ C4] ? __hrtimer_run_queues+0x110/0x1a0
2024-09-02T11:15:32.315099+02:00 lisa kernel: [ C4] ? hrtimer_interrupt+0xf5/0x210
2024-09-02T11:15:32.315101+02:00 lisa kernel: [ C4] ? __sysvec_apic_timer_interrupt+0x4e/0x60
2024-09-02T11:15:32.315104+02:00 lisa kernel: [ C4] ? sysvec_apic_timer_interrupt+0x64/0x80
2024-09-02T11:15:32.315106+02:00 lisa kernel: [ C4] </IRQ>
2024-09-02T11:15:32.315108+02:00 lisa kernel: [ C4] <TASK>
2024-09-02T11:15:32.315111+02:00 lisa kernel: [ C4] ? asm_sysvec_apic_timer_interrupt+0x1a/0x20
2024-09-02T11:15:32.315113+02:00 lisa kernel: [ C4] ? queued_spin_lock_slowpath+0x46/0x1b0
2024-09-02T11:15:32.315115+02:00 lisa kernel: [ C4] ? srso_alias_return_thunk+0x5/0xfbef5
2024-09-02T11:15:32.315117+02:00 lisa kernel: [ C4] ? fuse_iget+0x11c/0x250 [fuse]
2024-09-02T11:15:32.315120+02:00 lisa kernel: [ C4] ? fuse_fill_super_common+0x362/0x480 [fuse]
2024-09-02T11:15:32.315122+02:00 lisa kernel: [ C4] ? fuse_fill_super_common+0x480/0x480 [fuse]
2024-09-02T11:15:32.315124+02:00 lisa kernel: [ C4] ? fuse_fill_super+0x54/0x90 [fuse]
2024-09-02T11:15:32.315126+02:00 lisa kernel: [ C4] ? get_tree_nodev+0x64/0x90
2024-09-02T11:15:32.315128+02:00 lisa kernel: [ C4] ? fget+0x75/0xb0
2024-09-02T11:15:32.315129+02:00 lisa kernel: [ C4] ? fuse_get_tree+0xbd/0x190 [fuse]
2024-09-02T11:15:32.315132+02:00 lisa kernel: [ C4] ? vfs_get_tree+0x24/0xd0
2024-09-02T11:15:32.315134+02:00 lisa kernel: [ C4] ? srso_alias_return_thunk+0x5/0xfbef5
2024-09-02T11:15:32.315136+02:00 lisa kernel: [ C4] ? path_mount+0x472/0xab0
2024-09-02T11:15:32.315138+02:00 lisa kernel: [ C4] ? __x64_sys_mount+0x103/0x140
2024-09-02T11:15:32.315139+02:00 lisa kernel: [ C4] ? do_syscall_64+0x5f/0x170
2024-09-02T11:15:32.315140+02:00 lisa kernel: [ C4] ? entry_SYSCALL_64_after_hwframe+0x55/0x5d
2024-09-02T11:15:32.315142+02:00 lisa kernel: [ C4] </TASK>
2024-09-02T11:15:34.520022+02:00 lisa kernel: [ T18] rcu: INFO: rcu_preempt detected expedited stalls on CPUs/tasks: { 4-.... } 21130 jiffies s: 965 root: 0x10/.
2024-09-02T11:15:34.520027+02:00 lisa kernel: [ T18] rcu: blocking rcu_node structures (internal RCU debug):
2024-09-02T11:15:34.520029+02:00 lisa kernel: [ T18] Sending NMI from CPU 0 to CPUs 4:
2024-09-02T11:15:34.520030+02:00 lisa kernel: [ C4] NMI backtrace for cpu 4
2024-09-02T11:15:34.520032+02:00 lisa kernel: [ C4] CPU: 4 UID: 0 PID: 1282 Comm: fusermount3 Tainted: G L 6.11.0-rc6-next-20240902-master #366
2024-09-02T11:15:34.520033+02:00 lisa kernel: [ C4] Tainted: [L]=SOFTLOCKUP
2024-09-02T11:15:34.520036+02:00 lisa kernel: [ C4] Hardware name: Micro-Star International Co., Ltd. Alpha 15 B5EEK/MS-158L, BIOS E158LAMS.107 11/10/2021
2024-09-02T11:15:34.520038+02:00 lisa kernel: [ C4] RIP: 0010:queued_spin_lock_slowpath+0x46/0x1b0
2024-09-02T11:15:34.520040+02:00 lisa kernel: [ C4] Code: 0f 92 c1 8b 02 0f b6 c9 c1 e1 08 30 e4 09 c8 3d ff 00 00 00 0f 87 e9 00 00 00 85 c0 74 10 0f b6 02 84 c0 74 09 f3 90 0f b6 02 <84> c0 75 f7 b8 01 00 00 00 66 89 02 e9 54 dd 1d 00 8b 37 b8 00 02
2024-09-02T11:15:34.520041+02:00 lisa kernel: [ C4] RSP: 0018:ffffb64a45267d08 EFLAGS: 00000202
2024-09-02T11:15:34.520044+02:00 lisa kernel: [ C4] RAX: 0000000000000001 RBX: ffff9f0cd1187a38 RCX: 0000000000000000
2024-09-02T11:15:34.520046+02:00 lisa kernel: [ C4] RDX: ffff9f0cd1187a38 RSI: 0000000000000001 RDI: ffff9f0cd1187a38
2024-09-02T11:15:34.520048+02:00 lisa kernel: [ C4] RBP: 0000000000000000 R08: 0000000000000001 R09: ffffffff8b0261c8
2024-09-02T11:15:34.520049+02:00 lisa kernel: [ C4] R10: 0000000000000001 R11: 0000000000000005 R12: ffffb64a45267d58
2024-09-02T11:15:34.520050+02:00 lisa kernel: [ C4] R13: ffff9f0cd1187700 R14: 0000000000000000 R15: ffff9f0c89b73c00
2024-09-02T11:15:34.520052+02:00 lisa kernel: [ C4] FS: 00007fde155f0740(0000) GS:ffff9f1b2e700000(0000) knlGS:0000000000000000
2024-09-02T11:15:34.520054+02:00 lisa kernel: [ C4] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
2024-09-02T11:15:34.520056+02:00 lisa kernel: [ C4] CR2: 00007fde157327b0 CR3: 000000018167a000 CR4: 0000000000750ef0
2024-09-02T11:15:34.520057+02:00 lisa kernel: [ C4] PKRU: 55555554
2024-09-02T11:15:34.520058+02:00 lisa kernel: [ C4] Call Trace:
2024-09-02T11:15:34.520060+02:00 lisa kernel: [ C4] <NMI>
2024-09-02T11:15:34.520062+02:00 lisa kernel: [ C4] ? nmi_cpu_backtrace.cold+0x32/0x63
2024-09-02T11:15:34.520064+02:00 lisa kernel: [ C4] ? nmi_cpu_backtrace_handler+0xc/0x20
2024-09-02T11:15:34.520066+02:00 lisa kernel: [ C4] ? nmi_handle+0x53/0xc0
2024-09-02T11:15:34.520068+02:00 lisa kernel: [ C4] ? default_do_nmi+0x40/0x260
2024-09-02T11:15:34.520069+02:00 lisa kernel: [ C4] ? exc_nmi+0xe0/0x110
2024-09-02T11:15:34.520072+02:00 lisa kernel: [ C4] ? end_repeat_nmi+0xf/0x41
2024-09-02T11:15:34.520074+02:00 lisa kernel: [ C4] ? queued_spin_lock_slowpath+0x46/0x1b0
2024-09-02T11:15:34.520075+02:00 lisa kernel: [ C4] ? queued_spin_lock_slowpath+0x46/0x1b0
2024-09-02T11:15:34.520077+02:00 lisa kernel: [ C4] ? queued_spin_lock_slowpath+0x46/0x1b0
2024-09-02T11:15:34.520078+02:00 lisa kernel: [ C4] </NMI>
2024-09-02T11:15:34.520080+02:00 lisa kernel: [ C4] <TASK>
2024-09-02T11:15:34.520081+02:00 lisa kernel: [ C4] ? fuse_iget+0x11c/0x250 [fuse]
I bisected the error to commit 5fb9c98e9d8d ("fuse: add support for no forget requests").
As a locking issue seemed likely I recompiled next-20240902 with CONFIG_LOCKDEP=y
and got this (in addition to the messages above)
2024-09-02T14:57:03.788867+02:00 lisa kernel: [ T1283] ============================================
2024-09-02T14:57:03.788870+02:00 lisa kernel: [ T1283] WARNING: possible recursive locking detected
2024-09-02T14:57:03.788871+02:00 lisa kernel: [ T1283] 6.11.0-rc6-next-20240902-debug #383 Not tainted
2024-09-02T14:57:03.788873+02:00 lisa kernel: [ T1283] --------------------------------------------
2024-09-02T14:57:03.788875+02:00 lisa kernel: [ T1283] fusermount3/1283 is trying to acquire lock:
2024-09-02T14:57:03.788877+02:00 lisa kernel: [ T1283] ffff951a718dfb40 (&fi->lock){+.+.}-{2:2}, at: fuse_iget+0x11c/0x250 [fuse]
2024-09-02T14:57:03.788880+02:00 lisa kernel: [ T1283]
2024-09-02T14:57:03.788882+02:00 lisa kernel: [ T1283] but task is already holding lock:
2024-09-02T14:57:03.788884+02:00 lisa kernel: [ T1283] ffff951a718dfb40 (&fi->lock){+.+.}-{2:2}, at: fuse_iget+0x10c/0x250 [fuse]
2024-09-02T14:57:03.788886+02:00 lisa kernel: [ T1283]
2024-09-02T14:57:03.788888+02:00 lisa kernel: [ T1283] other info that might help us debug this:
2024-09-02T14:57:03.788889+02:00 lisa kernel: [ T1283] Possible unsafe locking scenario:
2024-09-02T14:57:03.788891+02:00 lisa kernel: [ T1283]
2024-09-02T14:57:03.788893+02:00 lisa kernel: [ T1283] CPU0
2024-09-02T14:57:03.788895+02:00 lisa kernel: [ T1283] ----
2024-09-02T14:57:03.788897+02:00 lisa kernel: [ T1283] lock(&fi->lock);
2024-09-02T14:57:03.788899+02:00 lisa kernel: [ T1283] lock(&fi->lock);
2024-09-02T14:57:03.788900+02:00 lisa kernel: [ T1283]
2024-09-02T14:57:03.788903+02:00 lisa kernel: [ T1283] *** DEADLOCK ***
2024-09-02T14:57:03.788905+02:00 lisa kernel: [ T1283]
2024-09-02T14:57:03.788906+02:00 lisa kernel: [ T1283] May be due to missing lock nesting notation
2024-09-02T14:57:03.788908+02:00 lisa kernel: [ T1283]
2024-09-02T14:57:03.788910+02:00 lisa kernel: [ T1283] 2 locks held by fusermount3/1283:
2024-09-02T14:57:03.788912+02:00 lisa kernel: [ T1283] #0: ffff951a82ca70e0 (&type->s_umount_key#54/1){+.+.}-{3:3}, at: alloc_super+0xd4/0x3d0
2024-09-02T14:57:03.788913+02:00 lisa kernel: [ T1283] #1: ffff951a718dfb40 (&fi->lock){+.+.}-{2:2}, at: fuse_iget+0x10c/0x250 [fuse]
2024-09-02T14:57:03.788914+02:00 lisa kernel: [ T1283]
2024-09-02T14:57:03.788916+02:00 lisa kernel: [ T1283] stack backtrace:
2024-09-02T14:57:03.788918+02:00 lisa kernel: [ T1283] CPU: 0 UID: 0 PID: 1283 Comm: fusermount3 Not tainted 6.11.0-rc6-next-20240902-debug #383
2024-09-02T14:57:03.788920+02:00 lisa kernel: [ T1283] Hardware name: Micro-Star International Co., Ltd. Alpha 15 B5EEK/MS-158L, BIOS E158LAMS.107 11/10/2021
2024-09-02T14:57:03.788939+02:00 lisa kernel: [ T1283] Call Trace:
2024-09-02T14:57:03.788942+02:00 lisa kernel: [ T1283] <TASK>
2024-09-02T14:57:03.788944+02:00 lisa kernel: [ T1283] ? dump_stack_lvl+0x6d/0xb0
2024-09-02T14:57:03.788945+02:00 lisa kernel: [ T1283] ? print_deadlock_bug.cold+0xbd/0xcc
2024-09-02T14:57:03.788948+02:00 lisa kernel: [ T1283] ? __lock_acquire+0x14e6/0x2780
2024-09-02T14:57:03.788951+02:00 lisa kernel: [ T1283] ? lock_acquire+0xd5/0x300
2024-09-02T14:57:03.788953+02:00 lisa kernel: [ T1283] ? fuse_iget+0x11c/0x250 [fuse]
2024-09-02T14:57:03.788956+02:00 lisa kernel: [ T1283] ? fuse_iget+0x23c/0x250 [fuse]
2024-09-02T14:57:03.788959+02:00 lisa kernel: [ T1283] ? srso_alias_return_thunk+0x5/0xfbef5
2024-09-02T14:57:03.788961+02:00 lisa kernel: [ T1283] ? _raw_spin_lock+0x2b/0x40
2024-09-02T14:57:03.788979+02:00 lisa kernel: [ T1283] ? fuse_iget+0x11c/0x250 [fuse]
2024-09-02T14:57:03.788981+02:00 lisa kernel: [ T1283] ? fuse_iget+0x11c/0x250 [fuse]
2024-09-02T14:57:03.788996+02:00 lisa kernel: [ T1283] ? fuse_fill_super_common+0x32a/0x450 [fuse]
2024-09-02T14:57:03.788998+02:00 lisa kernel: [ T1283] ? fuse_fill_super_common+0x450/0x450 [fuse]
2024-09-02T14:57:03.789001+02:00 lisa kernel: [ T1283] ? fuse_fill_super+0x57/0x90 [fuse]
2024-09-02T14:57:03.789004+02:00 lisa kernel: [ T1283] ? get_tree_nodev+0x67/0x90
2024-09-02T14:57:03.789006+02:00 lisa kernel: [ T1283] ? fuse_get_tree+0xc3/0x1a0 [fuse]
2024-09-02T14:57:03.789008+02:00 lisa kernel: [ T1283] ? vfs_get_tree+0x27/0xe0
2024-09-02T14:57:03.789011+02:00 lisa kernel: [ T1283] ? path_mount+0x483/0xba0
2024-09-02T14:57:03.789014+02:00 lisa kernel: [ T1283] ? __x64_sys_mount+0x103/0x140
2024-09-02T14:57:03.789015+02:00 lisa kernel: [ T1283] ? do_syscall_64+0x72/0x180
2024-09-02T14:57:03.789017+02:00 lisa kernel: [ T1283] ? entry_SYSCALL_64_after_hwframe+0x55/0x5d
2024-09-02T14:57:03.789020+02:00 lisa kernel: [ T1283] </TASK>
Reverting commit 5fb9c98e9d8d cleanly in next-20240902 is not possible, but I found
that the following patch fixes the issue for me:
diff --git a/fs/fuse/inode.c b/fs/fuse/inode.c
index f4fe9199c706..d62eb6edc0aa 100644
--- a/fs/fuse/inode.c
+++ b/fs/fuse/inode.c
@@ -484,7 +484,9 @@ struct inode *fuse_iget(struct super_block *sb, u64 nodeid,
}
}
fi = get_fuse_inode(inode);
- fuse_inc_nlookup(fc, fi);
+ spin_lock(&fi->lock);
+ fi->nlookup++;
+ spin_unlock(&fi->lock);
done:
fuse_change_attributes(inode, attr, NULL, attr_valid, attr_version);
Bert KarwatzkiOn Mon, Sep 2, 2024 at 3:40 PM Bert Karwatzki <spasswolf@web.de> wrote: > > Since linux next-20240902 starting debian sid on my MSI Alpha 15 Laptop hangs > before the GUI is enabled. After rebooting into a working kernel (v6.11-rc6) > the following messages can be found in /var/log/kern.log: Thanks for the report. I reverted the no-forget patches from fuse.git#for-next. I know what the bug is (spin_lock instead of splin_unlock in the nlookup helpers), but this was clearly not tested (partially my fault) and not well reviewed (my fault completely), so this was just hurried through without proper QC. Thanks, Miklos
© 2016 - 2025 Red Hat, Inc.