Hello, syzbot found the following issue on: HEAD commit: 0434dbe32053 Merge tag 'linux_kselftest-next-6.11-rc1' of .. git tree: upstream console output: https://syzkaller.appspot.com/x/log.txt?x=1022e159980000 kernel config: https://syzkaller.appspot.com/x/.config?x=4b8bd5292e033239 dashboard link: https://syzkaller.appspot.com/bug?extid=9f1acdfd9f63909c2abe compiler: Debian clang version 15.0.6, GNU ld (GNU Binutils for Debian) 2.40 Unfortunately, I don't have any reproducer for this issue yet. Downloadable assets: disk image: https://storage.googleapis.com/syzbot-assets/3766752b5090/disk-0434dbe3.raw.xz vmlinux: https://storage.googleapis.com/syzbot-assets/e3608abc3f91/vmlinux-0434dbe3.xz kernel image: https://storage.googleapis.com/syzbot-assets/c133560ad498/bzImage-0434dbe3.xz IMPORTANT: if you fix the issue, please add the following tag to the commit: Reported-by: syzbot+9f1acdfd9f63909c2abe@xxxxxxxxxxxxxxxxxxxxxxxxx INFO: task syz.2.440:10220 blocked for more than 143 seconds. Not tainted 6.10.0-syzkaller-02711-g0434dbe32053 #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. task:syz.2.440 state:D stack:24336 pid:10220 tgid:10176 ppid:9432 flags:0x00004004 Call Trace: <TASK> context_switch kernel/sched/core.c:5188 [inline] __schedule+0x17ae/0x4a10 kernel/sched/core.c:6529 __schedule_loop kernel/sched/core.c:6606 [inline] schedule+0x14b/0x320 kernel/sched/core.c:6621 __bch2_two_state_lock+0x171/0x200 fs/bcachefs/two_state_shared_lock.c:7 bch2_two_state_lock fs/bcachefs/two_state_shared_lock.h:56 [inline] bch2_read_iter+0x2e4/0x1430 fs/bcachefs/fs-io-direct.c:207 __kernel_read+0x532/0x9f0 fs/read_write.c:434 integrity_kernel_read+0xb0/0x100 security/integrity/iint.c:28 ima_calc_file_hash_tfm security/integrity/ima/ima_crypto.c:480 [inline] ima_calc_file_shash security/integrity/ima/ima_crypto.c:511 [inline] ima_calc_file_hash+0xaef/0x1b30 security/integrity/ima/ima_crypto.c:568 ima_collect_measurement+0x526/0xb20 security/integrity/ima/ima_api.c:293 process_measurement+0x1357/0x1fb0 security/integrity/ima/ima_main.c:372 ima_file_check+0xf2/0x170 security/integrity/ima/ima_main.c:572 security_file_post_open+0x6d/0xa0 security/security.c:3008 do_open fs/namei.c:3729 [inline] path_openat+0x2b91/0x3470 fs/namei.c:3886 do_filp_open+0x235/0x490 fs/namei.c:3913 do_sys_openat2+0x13e/0x1d0 fs/open.c:1416 do_sys_open fs/open.c:1431 [inline] __do_sys_open fs/open.c:1439 [inline] __se_sys_open fs/open.c:1435 [inline] __x64_sys_open+0x225/0x270 fs/open.c:1435 do_syscall_x64 arch/x86/entry/common.c:52 [inline] do_syscall_64+0xf3/0x230 arch/x86/entry/common.c:83 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7f3e8bd75a19 RSP: 002b:00007f3e8cb35048 EFLAGS: 00000246 ORIG_RAX: 0000000000000002 RAX: ffffffffffffffda RBX: 00007f3e8bf04038 RCX: 00007f3e8bd75a19 RDX: 0000000000000000 RSI: 0000000000000000 RDI: 00000000200000c0 RBP: 00007f3e8bde4e49 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 000000000000006e R14: 00007f3e8bf04038 R15: 00007ffdb5607118 </TASK> Showing all locks held in the system: 2 locks held by kworker/u8:1/12: #0: ffff8880b953e718 (&rq->__lock){-.-.}-{2:2}, at: raw_spin_rq_lock_nested+0x2a/0x140 kernel/sched/core.c:560 #1: ffff8880b9528948 (&per_cpu_ptr(group->pcpu, cpu)->seq){-.-.}-{0:0}, at: psi_task_switch+0x441/0x770 kernel/sched/psi.c:989 1 lock held by khungtaskd/30: #0: ffffffff8e335fe0 (rcu_read_lock){....}-{1:2}, at: rcu_lock_acquire include/linux/rcupdate.h:327 [inline] #0: ffffffff8e335fe0 (rcu_read_lock){....}-{1:2}, at: rcu_read_lock include/linux/rcupdate.h:839 [inline] #0: ffffffff8e335fe0 (rcu_read_lock){....}-{1:2}, at: debug_show_all_locks+0x55/0x2a0 kernel/locking/lockdep.c:6613 3 locks held by kworker/u8:4/62: 2 locks held by getty/4845: #0: ffff88802af9c0a0 (&tty->ldisc_sem){++++}-{0:0}, at: tty_ldisc_ref_wait+0x25/0x70 drivers/tty/tty_ldisc.c:243 #1: ffffc90002f162f0 (&ldata->atomic_read_lock){+.+.}-{3:3}, at: n_tty_read+0x6b5/0x1e10 drivers/tty/n_tty.c:2211 1 lock held by syz.2.440/10220: #0: ffff88802dca25b8 (&ima_iint_mutex_key[depth]){+.+.}-{3:3}, at: process_measurement+0x7ac/0x1fb0 security/integrity/ima/ima_main.c:269 3 locks held by syz.2.440/10221: #0: ffff888052178ac8 (&f->f_pos_lock){+.+.}-{3:3}, at: __fdget_pos+0x24e/0x310 fs/file.c:1191 #1: ffff888023750420 (sb_writers#24){.+.+}-{0:0}, at: file_start_write include/linux/fs.h:2876 [inline] #1: ffff888023750420 (sb_writers#24){.+.+}-{0:0}, at: vfs_write+0x227/0xc90 fs/read_write.c:586 #2: ffff888076fdf748 (&sb->s_type->i_mutex_key#30){+.+.}-{3:3}, at: inode_lock include/linux/fs.h:799 [inline] #2: ffff888076fdf748 (&sb->s_type->i_mutex_key#30){+.+.}-{3:3}, at: bch2_direct_write+0x243/0x3050 fs/bcachefs/fs-io-direct.c:598 2 locks held by bch-copygc/loop/10212: 1 lock held by syz-executor/10857: #0: ffffffff8e33b3b8 (rcu_state.exp_mutex){+.+.}-{3:3}, at: exp_funnel_lock kernel/rcu/tree_exp.h:328 [inline] #0: ffffffff8e33b3b8 (rcu_state.exp_mutex){+.+.}-{3:3}, at: synchronize_rcu_expedited+0x451/0x830 kernel/rcu/tree_exp.h:958 1 lock held by syz-executor/11676: #0: ffffffff8e33b3b8 (rcu_state.exp_mutex){+.+.}-{3:3}, at: exp_funnel_lock kernel/rcu/tree_exp.h:296 [inline] #0: ffffffff8e33b3b8 (rcu_state.exp_mutex){+.+.}-{3:3}, at: synchronize_rcu_expedited+0x381/0x830 kernel/rcu/tree_exp.h:958 ============================================= NMI backtrace for cpu 0 CPU: 0 PID: 30 Comm: khungtaskd Not tainted 6.10.0-syzkaller-02711-g0434dbe32053 #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 06/07/2024 Call Trace: <TASK> __dump_stack lib/dump_stack.c:88 [inline] dump_stack_lvl+0x241/0x360 lib/dump_stack.c:114 nmi_cpu_backtrace+0x49c/0x4d0 lib/nmi_backtrace.c:113 nmi_trigger_cpumask_backtrace+0x198/0x320 lib/nmi_backtrace.c:62 trigger_all_cpu_backtrace include/linux/nmi.h:162 [inline] check_hung_uninterruptible_tasks kernel/hung_task.c:223 [inline] watchdog+0xfde/0x1020 kernel/hung_task.c:379 kthread+0x2f0/0x390 kernel/kthread.c:389 ret_from_fork+0x4b/0x80 arch/x86/kernel/process.c:147 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:244 </TASK> Sending NMI from CPU 0 to CPUs 1: NMI backtrace for cpu 1 CPU: 1 PID: 10944 Comm: syz-executor Not tainted 6.10.0-syzkaller-02711-g0434dbe32053 #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 06/07/2024 RIP: 0010:check_preemption_disabled+0x4/0x120 lib/smp_processor_id.c:13 Code: 8c 48 c7 c6 80 62 1f 8c eb 1c 66 2e 0f 1f 84 00 00 00 00 00 66 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 41 57 41 56 <41> 54 53 48 83 ec 10 65 48 8b 04 25 28 00 00 00 48 89 44 24 08 65 RSP: 0018:ffffc900046d7688 EFLAGS: 00000046 RAX: 0000000000000001 RBX: 0000000000000001 RCX: ffff88802885da00 RDX: ffff88802885da00 RSI: ffffffff8bcadaa0 RDI: ffffffff8c1f62a0 RBP: 0000000000000001 R08: ffffffff81d9769c R09: 1ffff92000226010 R10: dffffc0000000000 R11: fffff52000226011 R12: 0000000000000046 R13: ffff88802885da00 R14: 00000000ffffffff R15: ffffffff8e40b5d8 FS: 000055558fbb3500(0000) GS:ffff8880b9500000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007f4317ad2c78 CR3: 000000002ea96000 CR4: 00000000003506f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: <NMI> </NMI> <TASK> lockdep_recursion_finish kernel/locking/lockdep.c:466 [inline] lock_is_held_type+0x101/0x190 kernel/locking/lockdep.c:5825 lock_is_held include/linux/lockdep.h:231 [inline] pcpu_reintegrate_chunk mm/percpu.c:580 [inline] pcpu_alloc_noprof+0x816/0x16e0 mm/percpu.c:1836 xt_percpu_counter_alloc+0x150/0x1f0 net/netfilter/x_tables.c:1931 find_check_entry net/ipv4/netfilter/ip_tables.c:526 [inline] translate_table+0x12ec/0x2260 net/ipv4/netfilter/ip_tables.c:716 do_replace net/ipv4/netfilter/ip_tables.c:1137 [inline] do_ipt_set_ctl+0xe3d/0x1250 net/ipv4/netfilter/ip_tables.c:1635 nf_setsockopt+0x295/0x2c0 net/netfilter/nf_sockopt.c:101 do_sock_setsockopt+0x3af/0x720 net/socket.c:2324 __sys_setsockopt+0x1ae/0x250 net/socket.c:2347 __do_sys_setsockopt net/socket.c:2356 [inline] __se_sys_setsockopt net/socket.c:2353 [inline] __x64_sys_setsockopt+0xb5/0xd0 net/socket.c:2353 do_syscall_x64 arch/x86/entry/common.c:52 [inline] do_syscall_64+0xf3/0x230 arch/x86/entry/common.c:83 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7f431797780a Code: ff ff ff c3 0f 1f 40 00 48 c7 c2 a8 ff ff ff f7 d8 64 89 02 48 c7 c0 ff ff ff ff eb b7 0f 1f 00 49 89 ca b8 36 00 00 00 0f 05 <48> 3d 00 f0 ff ff 77 06 c3 0f 1f 44 00 00 48 c7 c2 a8 ff ff ff f7 RSP: 002b:00007ffc9e46ff28 EFLAGS: 00000202 ORIG_RAX: 0000000000000036 RAX: ffffffffffffffda RBX: 00007ffc9e46ffb0 RCX: 00007f431797780a RDX: 0000000000000040 RSI: 0000000000000000 RDI: 0000000000000003 RBP: 0000000000000003 R08: 0000000000000408 R09: 00007ffc9e470367 R10: 00007f4317ad2c20 R11: 0000000000000202 R12: 00007f4317ad2bc0 R13: 00007ffc9e46ff4c R14: 0000000000000000 R15: 00007f4317ad4000 </TASK> --- 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@xxxxxxxxxxxxxxxx. 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 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
