syzbot has found a reproducer for the following issue on: HEAD commit: 3b47bc037bd4 Merge tag 'pinctrl-v6.7-2' of git://git.kerne.. git tree: upstream console output: https://syzkaller.appspot.com/x/log.txt?x=14e6bdaae80000 kernel config: https://syzkaller.appspot.com/x/.config?x=c2c74446ab4f0028 dashboard link: https://syzkaller.appspot.com/bug?extid=e245f0516ee625aaa412 compiler: Debian clang version 15.0.6, GNU ld (GNU Binutils for Debian) 2.40 syz repro: https://syzkaller.appspot.com/x/repro.syz?x=11026e54e80000 Downloadable assets: disk image: https://storage.googleapis.com/syzbot-assets/43de6cde1436/disk-3b47bc03.raw.xz vmlinux: https://storage.googleapis.com/syzbot-assets/24a2ba210bcf/vmlinux-3b47bc03.xz kernel image: https://storage.googleapis.com/syzbot-assets/a5d414ced6d5/bzImage-3b47bc03.xz mounted in repro: https://storage.googleapis.com/syzbot-assets/c28d17ae0132/mount_4.gz IMPORTANT: if you fix the issue, please add the following tag to the commit: Reported-by: syzbot+e245f0516ee625aaa412@xxxxxxxxxxxxxxxxxxxxxxxxx INFO: task syz-executor.0:24270 blocked for more than 143 seconds. Not tainted 6.7.0-rc3-syzkaller-00033-g3b47bc037bd4 #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. task:syz-executor.0 state:D stack:28784 pid:24270 tgid:24259 ppid:5149 flags:0x00004006 Call Trace: <TASK> context_switch kernel/sched/core.c:5376 [inline] __schedule+0x1961/0x4ab0 kernel/sched/core.c:6688 __schedule_loop kernel/sched/core.c:6763 [inline] schedule+0x149/0x260 kernel/sched/core.c:6778 schedule_preempt_disabled+0x13/0x20 kernel/sched/core.c:6835 __mutex_lock_common kernel/locking/mutex.c:679 [inline] __mutex_lock+0x6a3/0xd60 kernel/locking/mutex.c:747 __fdget_pos+0x2b0/0x340 fs/file.c:1177 fdget_pos include/linux/file.h:74 [inline] __do_sys_getdents64 fs/readdir.c:401 [inline] __se_sys_getdents64+0x1dc/0x4f0 fs/readdir.c:390 do_syscall_x64 arch/x86/entry/common.c:51 [inline] do_syscall_64+0x45/0x110 arch/x86/entry/common.c:82 entry_SYSCALL_64_after_hwframe+0x63/0x6b RIP: 0033:0x7fd0cec7cae9 RSP: 002b:00007fd0cfa610c8 EFLAGS: 00000246 ORIG_RAX: 00000000000000d9 RAX: ffffffffffffffda RBX: 00007fd0ced9c050 RCX: 00007fd0cec7cae9 RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000005 RBP: 00007fd0cecc847a R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 000000000000006e R14: 00007fd0ced9c050 R15: 00007ffeeda72018 </TASK> Showing all locks held in the system: 1 lock held by khungtaskd/29: #0: ffffffff8d92cf60 (rcu_read_lock){....}-{1:2}, at: rcu_lock_acquire include/linux/rcupdate.h:301 [inline] #0: ffffffff8d92cf60 (rcu_read_lock){....}-{1:2}, at: rcu_read_lock include/linux/rcupdate.h:747 [inline] #0: ffffffff8d92cf60 (rcu_read_lock){....}-{1:2}, at: debug_show_all_locks+0x55/0x2a0 kernel/locking/lockdep.c:6614 2 locks held by getty/4818: #0: ffff88814afe20a0 (&tty->ldisc_sem){++++}-{0:0}, at: tty_ldisc_ref_wait+0x25/0x70 drivers/tty/tty_ldisc.c:243 #1: ffffc900031332f0 (&ldata->atomic_read_lock){+.+.}-{3:3}, at: n_tty_read+0x6b4/0x1e10 drivers/tty/n_tty.c:2201 1 lock held by syz-executor.5/5143: 3 locks held by syz-executor.0/24262: 1 lock held by syz-executor.0/24270: #0: ffff88807c5574c8 (&f->f_pos_lock){+.+.}-{3:3}, at: __fdget_pos+0x2b0/0x340 fs/file.c:1177 1 lock held by syz-executor.0/24319: 2 locks held by syz-executor.1/32017: #0: ffff8880b983c358 (&rq->__lock){-.-.}-{2:2}, at: raw_spin_rq_lock_nested+0x2a/0x140 kernel/sched/core.c:558 #1: ffff8880b9828808 (&per_cpu_ptr(group->pcpu, cpu)->seq){-.-.}-{0:0}, at: psi_task_switch+0x441/0x770 kernel/sched/psi.c:988 1 lock held by syz-executor.1/32030: #0: ffff8880b983c358 (&rq->__lock){-.-.}-{2:2}, at: raw_spin_rq_lock_nested+0x2a/0x140 kernel/sched/core.c:558 2 locks held by syz-executor.4/32028: #0: ffff8880b983c358 (&rq->__lock){-.-.}-{2:2}, at: raw_spin_rq_lock_nested+0x2a/0x140 kernel/sched/core.c:558 #1: ffff8880b9828808 (&per_cpu_ptr(group->pcpu, cpu)->seq){-.-.}-{0:0}, at: psi_task_switch+0x441/0x770 kernel/sched/psi.c:988 2 locks held by syz-executor.3/32042: #0: ffff88801cfea360 (&lo->lo_mutex){+.+.}-{3:3}, at: loop_global_lock_killable drivers/block/loop.c:120 [inline] #0: ffff88801cfea360 (&lo->lo_mutex){+.+.}-{3:3}, at: loop_configure+0x1f9/0x1250 drivers/block/loop.c:1023 #1: ffffe8ffffd6a108 (&per_cpu_ptr(group->pcpu, cpu)->seq){-.-.}-{0:0}, at: psi_task_switch+0x3a7/0x770 kernel/sched/psi.c:976 4 locks held by syz-executor.0/32045: ============================================= NMI backtrace for cpu 1 CPU: 1 PID: 29 Comm: khungtaskd Not tainted 6.7.0-rc3-syzkaller-00033-g3b47bc037bd4 #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 11/10/2023 Call Trace: <TASK> __dump_stack lib/dump_stack.c:88 [inline] dump_stack_lvl+0x1e7/0x2d0 lib/dump_stack.c:106 nmi_cpu_backtrace+0x498/0x4d0 lib/nmi_backtrace.c:113 nmi_trigger_cpumask_backtrace+0x198/0x310 lib/nmi_backtrace.c:62 trigger_all_cpu_backtrace include/linux/nmi.h:160 [inline] check_hung_uninterruptible_tasks kernel/hung_task.c:222 [inline] watchdog+0xfaf/0xff0 kernel/hung_task.c:379 kthread+0x2d3/0x370 kernel/kthread.c:388 ret_from_fork+0x48/0x80 arch/x86/kernel/process.c:147 ret_from_fork_asm+0x11/0x20 arch/x86/entry/entry_64.S:242 </TASK> Sending NMI from CPU 1 to CPUs 0: NMI backtrace for cpu 0 CPU: 0 PID: 5138 Comm: syz-executor.1 Not tainted 6.7.0-rc3-syzkaller-00033-g3b47bc037bd4 #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 11/10/2023 RIP: 0010:orc_find arch/x86/kernel/unwind_orc.c:217 [inline] RIP: 0010:unwind_next_frame+0x271/0x29e0 arch/x86/kernel/unwind_orc.c:494 Code: 50 00 39 eb 0f 86 f7 1d 00 00 89 e8 48 8d 1c 85 08 26 20 90 48 89 d8 48 c1 e8 03 49 be 00 00 00 00 00 fc ff df 42 0f b6 04 30 <84> c0 0f 85 89 20 00 00 44 8b 3b 89 e8 ff c0 48 8d 1c 85 08 26 20 RSP: 0018:ffffc90003f3f700 EFLAGS: 00000a06 RAX: 0000000000000000 RBX: ffffffff90211d88 RCX: 00000000000a6001 RDX: ffff88801eaa3b80 RSI: 0000000000003de0 RDI: 00000000000a6000 RBP: 0000000000003de0 R08: ffffffff813db069 R09: 0000000000000000 R10: ffffc90003f3f840 R11: fffff520007e7f14 R12: ffffc90003f3f840 R13: 00000000000a6001 R14: dffffc0000000000 R15: ffffffff813de03c FS: 0000555556748480(0000) GS:ffff8880b9800000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007f84b6775198 CR3: 00000000200ef000 CR4: 00000000003506f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: <NMI> </NMI> <TASK> __unwind_start+0x641/0x7a0 arch/x86/kernel/unwind_orc.c:760 unwind_start arch/x86/include/asm/unwind.h:64 [inline] arch_stack_walk+0xfd/0x1a0 arch/x86/kernel/stacktrace.c:24 stack_trace_save+0x117/0x1c0 kernel/stacktrace.c:122 kasan_save_stack mm/kasan/common.c:45 [inline] kasan_set_track+0x4f/0x70 mm/kasan/common.c:52 __kasan_slab_alloc+0x66/0x70 mm/kasan/common.c:328 kasan_slab_alloc include/linux/kasan.h:188 [inline] slab_post_alloc_hook+0x6c/0x3c0 mm/slab.h:763 slab_alloc_node mm/slub.c:3478 [inline] slab_alloc mm/slub.c:3486 [inline] __kmem_cache_alloc_lru mm/slub.c:3493 [inline] kmem_cache_alloc+0x19e/0x2b0 mm/slub.c:3502 sk_prot_alloc+0x58/0x210 net/core/sock.c:2069 sk_alloc+0x38/0x370 net/core/sock.c:2128 inet_create+0x652/0xe20 net/ipv4/af_inet.c:325 __sock_create+0x48c/0x910 net/socket.c:1569 sock_create net/socket.c:1620 [inline] __sys_socket_create net/socket.c:1657 [inline] __sys_socket+0x14f/0x3b0 net/socket.c:1704 __do_sys_socket net/socket.c:1718 [inline] __se_sys_socket net/socket.c:1716 [inline] __x64_sys_socket+0x7a/0x90 net/socket.c:1716 do_syscall_x64 arch/x86/entry/common.c:51 [inline] do_syscall_64+0x45/0x110 arch/x86/entry/common.c:82 entry_SYSCALL_64_after_hwframe+0x63/0x6b RIP: 0033:0x7f84b667e867 Code: f0 ff ff 77 06 c3 0f 1f 44 00 00 48 c7 c2 b0 ff ff ff f7 d8 64 89 02 b8 ff ff ff ff c3 66 0f 1f 44 00 00 b8 29 00 00 00 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 b0 ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007ffed1a3ed28 EFLAGS: 00000206 ORIG_RAX: 0000000000000029 RAX: ffffffffffffffda RBX: 0000000000000003 RCX: 00007f84b667e867 RDX: 0000000000000006 RSI: 0000000000000001 RDI: 0000000000000002 RBP: 00007ffed1a3f43c R08: 00007ffed1a3ed1c R09: 00007ffed1a3f127 R10: 00007ffed1a3eda0 R11: 0000000000000206 R12: 0000000000000032 R13: 0000000000165078 R14: 0000000000165035 R15: 0000000000000008 </TASK> --- 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.
