Hello, syzbot found the following issue on: HEAD commit: 0babf683783d Merge tag 'pinctrl-v6.11-4' of git://git.kern.. git tree: upstream console output: https://syzkaller.appspot.com/x/log.txt?x=162de407980000 kernel config: https://syzkaller.appspot.com/x/.config?x=1c9e296880039df9 dashboard link: https://syzkaller.appspot.com/bug?extid=4145b11cdf925264bff4 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/5d6146edacfa/disk-0babf683.raw.xz vmlinux: https://storage.googleapis.com/syzbot-assets/2593d4fb261a/vmlinux-0babf683.xz kernel image: https://storage.googleapis.com/syzbot-assets/a5e44e1e0eba/bzImage-0babf683.xz IMPORTANT: if you fix the issue, please add the following tag to the commit: Reported-by: syzbot+4145b11cdf925264bff4@xxxxxxxxxxxxxxxxxxxxxxxxx rcu: INFO: rcu_preempt detected stalls on CPUs/tasks: rcu: Tasks blocked on level-0 rcu_node (CPUs 0-1): P9592/1:b..l rcu: (detected by 1, t=10502 jiffies, g=41797, q=358 ncpus=2) task:syz.1.962 state:R running task stack:24176 pid:9592 tgid:9589 ppid:9183 flags:0x00004006 Call Trace: <TASK> context_switch kernel/sched/core.c:5188 [inline] __schedule+0x17ae/0x4a10 kernel/sched/core.c:6529 preempt_schedule_irq+0xfb/0x1c0 kernel/sched/core.c:6851 irqentry_exit+0x5e/0x90 kernel/entry/common.c:354 asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:702 RIP: 0010:lock_acquire+0x264/0x550 kernel/locking/lockdep.c:5763 Code: 2b 00 74 08 4c 89 f7 e8 ea e1 87 00 f6 44 24 61 02 0f 85 85 01 00 00 41 f7 c7 00 02 00 00 74 01 fb 48 c7 44 24 40 0e 36 e0 45 <4b> c7 44 25 00 00 00 00 00 43 c7 44 25 09 00 00 00 00 43 c7 44 25 RSP: 0018:ffffc90003d47020 EFLAGS: 00000206 RAX: 0000000000000001 RBX: 1ffff920007a8e10 RCX: baa91729e815a300 RDX: dffffc0000000000 RSI: ffffffff8beae6e0 RDI: ffffffff8c3fbb00 RBP: ffffc90003d47168 R08: ffffffff93fa6847 R09: 1ffffffff27f4d08 R10: dffffc0000000000 R11: fffffbfff27f4d09 R12: 1ffff920007a8e0c R13: dffffc0000000000 R14: ffffc90003d47080 R15: 0000000000000246 rcu_lock_acquire include/linux/rcupdate.h:326 [inline] rcu_read_lock include/linux/rcupdate.h:838 [inline] filemap_get_entry+0x144/0x3b0 mm/filemap.c:1837 shmem_get_folio_gfp+0x29a/0x2370 mm/shmem.c:2104 shmem_fault+0x252/0x6f0 mm/shmem.c:2388 __do_fault+0x135/0x460 mm/memory.c:4672 do_read_fault mm/memory.c:5078 [inline] do_fault mm/memory.c:5208 [inline] do_pte_missing mm/memory.c:3964 [inline] handle_pte_fault+0x321f/0x6fc0 mm/memory.c:5538 __handle_mm_fault mm/memory.c:5681 [inline] handle_mm_fault+0x1056/0x1ad0 mm/memory.c:5849 faultin_page mm/gup.c:1194 [inline] __get_user_pages+0x6ec/0x16a0 mm/gup.c:1493 populate_vma_page_range+0x264/0x330 mm/gup.c:1932 __mm_populate+0x27a/0x460 mm/gup.c:2035 mm_populate include/linux/mm.h:3430 [inline] vm_mmap_pgoff+0x2c3/0x3d0 mm/util.c:593 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: 0033:0x7f848877def9 RSP: 002b:00007f848949c038 EFLAGS: 00000246 ORIG_RAX: 0000000000000009 RAX: ffffffffffffffda RBX: 00007f8488936058 RCX: 00007f848877def9 RDX: b635773f06ebbeee RSI: 0000000000b36000 RDI: 0000000020000000 RBP: 00007f84887f0b76 R08: ffffffffffffffff R09: 0000000000000000 R10: 0000000000008031 R11: 0000000000000246 R12: 0000000000000000 R13: 0000000000000000 R14: 00007f8488936058 R15: 00007ffd36b2c578 </TASK> rcu: rcu_preempt kthread starved for 10184 jiffies! g41797 f0x0 RCU_GP_WAIT_FQS(5) ->state=0x0 ->cpu=1 rcu: Unless rcu_preempt kthread gets sufficient CPU time, OOM is now expected behavior. rcu: RCU grace-period kthread stack dump: task:rcu_preempt state:R running task stack:26448 pid:17 tgid:17 ppid:2 flags:0x00004000 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 schedule_timeout+0x1be/0x310 kernel/time/timer.c:2581 rcu_gp_fqs_loop+0x2df/0x1330 kernel/rcu/tree.c:2034 rcu_gp_kthread+0xa7/0x3b0 kernel/rcu/tree.c:2236 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> rcu: Stack dump where RCU GP kthread last ran: CPU: 1 UID: 0 PID: 9590 Comm: syz.4.963 Not tainted 6.11.0-rc7-syzkaller-00149-g0babf683783d #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 08/06/2024 RIP: 0010:__bpf_trace_run kernel/trace/bpf_trace.c:2397 [inline] RIP: 0010:bpf_trace_run2+0x159/0x540 kernel/trace/bpf_trace.c:2447 Code: 08 42 80 3c 30 00 74 08 48 89 df e8 81 a7 58 00 48 89 5c 24 38 48 8b 03 bb 01 00 00 00 65 0f c1 18 31 ff 89 de e8 f7 87 f4 ff <85> db 0f 85 b4 02 00 00 49 83 c5 70 4c 89 e8 48 c1 e8 03 42 80 3c RSP: 0018:ffffc9000318fde0 EFLAGS: 00000297 RAX: 0000000000000002 RBX: 0000000000000000 RCX: 0000000000000000 RDX: ffff888026beda00 RSI: 0000000000000000 RDI: 0000000000000000 RBP: ffffc9000318fec8 R08: ffffffff819f08a9 R09: 0000000000000000 R10: ffffc9000318fe40 R11: fffff52000631fca R12: ffffc90003b05000 R13: ffff888033723100 R14: dffffc0000000000 R15: ffffc9000318fe40 FS: 00007fc00c8a16c0(0000) GS:ffff8880b8900000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 000000110c3f657a CR3: 0000000088454000 CR4: 00000000003526f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: <IRQ> </IRQ> <TASK> trace_sys_enter+0x93/0xd0 include/trace/events/syscalls.h:18 syscall_trace_enter+0xf8/0x150 kernel/entry/common.c:61 syscall_enter_from_user_mode_work include/linux/entry-common.h:168 [inline] syscall_enter_from_user_mode include/linux/entry-common.h:198 [inline] do_syscall_64+0xcc/0x230 arch/x86/entry/common.c:79 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7fc00bb19869 Code: 64 c7 00 16 00 00 00 b8 ff ff ff ff c3 0f 1f 40 00 90 66 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 00 48 c7 c0 0f 00 00 00 0f 05 <0f> 1f 80 00 00 00 00 48 81 ec 48 01 00 00 49 89 d0 64 48 8b 04 25 RSP: 002b:00007fc00c8a0b40 EFLAGS: 00000246 ORIG_RAX: 000000000000000f RAX: ffffffffffffffda RBX: 00007fc00bd35f88 RCX: 00007fc00bb19869 RDX: 00007fc00c8a0b40 RSI: 00007fc00c8a0c70 RDI: 0000000000000011 RBP: 00007fc00bd35f80 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 00007fc00bd35f8c R13: 0000000000000000 R14: 00007ffc51e12cf0 R15: 00007ffc51e12dd8 </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
