ci starts bisection 2023-04-20 02:16:47.441262511 +0000 UTC m=+28641.587793580 bisecting fixing commit since 200e340f2196d7fd427a5810d06e893b932f145a building syzkaller on 1c9013acc70de325dbb554c8c40c17ed02eff33f ensuring issue is reproducible on original commit 200e340f2196d7fd427a5810d06e893b932f145a testing commit 200e340f2196d7fd427a5810d06e893b932f145a gcc compiler: Debian clang version 15.0.7, GNU ld (GNU Binutils for Debian) 2.35.2 kernel signature: 4a784825da71559925726214670dc3eb9fc76eb5efdf2fcca1a1d18caf7ca007 run #0: crashed: INFO: rcu detected stall in corrupted run #1: crashed: INFO: rcu detected stall in corrupted run #2: crashed: INFO: rcu detected stall in corrupted run #3: crashed: INFO: rcu detected stall in corrupted run #4: crashed: INFO: rcu detected stall in corrupted run #5: crashed: INFO: rcu detected stall in corrupted run #6: crashed: INFO: rcu detected stall in sock_close run #7: crashed: INFO: rcu detected stall in worker_thread run #8: crashed: INFO: rcu detected stall in do_idle run #9: crashed: INFO: rcu detected stall in do_idle run #10: crashed: INFO: rcu detected stall in do_idle run #11: crashed: INFO: rcu detected stall in sys_clock_settime run #12: crashed: INFO: rcu detected stall in sys_clock_settime run #13: crashed: INFO: rcu detected stall in sys_futex run #14: crashed: INFO: rcu detected stall in sys_epoll_pwait run #15: crashed: INFO: rcu detected stall in sys_clock_settime run #16: crashed: INFO: rcu detected stall in corrupted run #17: crashed: INFO: rcu detected stall in sys_clock_settime run #18: crashed: INFO: rcu detected stall in sys_clock_settime run #19: crashed: INFO: rcu detected stall in syscall_exit_to_user_mode testing current HEAD cb0856346a60fe3eb837ba5e73588a41f81ac05f testing commit cb0856346a60fe3eb837ba5e73588a41f81ac05f gcc compiler: Debian clang version 15.0.7, GNU ld (GNU Binutils for Debian) 2.35.2 kernel signature: 54aab4ed038b3f46d05dd1f73086f3c6a7adb70c841bdd39db8a2c22041706b5 run #0: crashed: INFO: rcu detected stall in do_idle run #1: crashed: INFO: rcu detected stall in do_idle run #2: crashed: INFO: rcu detected stall in sys_clock_settime run #3: crashed: INFO: rcu detected stall in syscall_enter_from_user_mode run #4: crashed: INFO: rcu detected stall in do_idle run #5: crashed: INFO: rcu detected stall in do_idle run #6: crashed: INFO: rcu detected stall in sys_futex run #7: crashed: INFO: rcu detected stall in syscall_exit_to_user_mode run #8: crashed: INFO: rcu detected stall in do_idle run #9: crashed: INFO: rcu detected stall in sys_openat revisions tested: 2, total time: 34m8.875262581s (build: 18m56.690796986s, test: 14m33.168451719s) the crash still happens on HEAD commit msg: Merge tag 'mm-hotfixes-stable-2023-04-19-16-36' of git://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm crash: INFO: rcu detected stall in sys_openat rcu: INFO: rcu_preempt detected stalls on CPUs/tasks: rcu: 1-...!: (1 GPs behind) idle=2cdc/1/0x4000000000000000 softirq=10590/10591 fqs=0 rcu: (detected by 0, t=10506 jiffies, g=7957, q=162 ncpus=2) Sending NMI from CPU 0 to CPUs 1: NMI backtrace for cpu 1 CPU: 1 PID: 4398 Comm: udevd Not tainted 6.3.0-rc7-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 03/30/2023 RIP: 0010:__lock_acquire+0x69/0x1f80 Code: df 0f b6 04 10 84 c0 0f 85 fb 15 00 00 83 3d 01 37 77 0b 00 0f 84 a8 14 00 00 83 3d f0 a3 20 0a 00 74 2b 4c 89 f0 48 c1 e8 03 <80> 3c 10 00 74 12 4c 89 f7 e8 a9 e5 62 00 48 ba 00 00 00 00 00 fc RSP: 0018:ffffc900001e0a20 EFLAGS: 00000806 RAX: 1ffff1100e257c60 RBX: 0000000000000001 RCX: 0000000000000000 RDX: dffffc0000000000 RSI: 0000000000000000 RDI: ffff8880712be300 RBP: 0000000000000000 R08: 0000000000000001 R09: 0000000000000001 R10: 0000000000000000 R11: dffffc0000000001 R12: 0000000000000000 R13: ffff88807d7b0000 R14: ffff8880712be300 R15: 0000000000000001 FS: 00007fa43ce92840(0000) GS:ffff8880b9d00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000000020001b80 CR3: 00000000249a5000 CR4: 00000000003506e0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: lock_acquire+0x1e1/0x520 _raw_spin_lock+0x2e/0x40 advance_sched+0xb3/0x9a0 __hrtimer_run_queues+0x4d8/0xa70 hrtimer_interrupt+0x36b/0x8c0 __sysvec_apic_timer_interrupt+0x13f/0x480 sysvec_apic_timer_interrupt+0x90/0xb0 asm_sysvec_apic_timer_interrupt+0x1a/0x20 RIP: 0010:_raw_spin_unlock_irqrestore+0xd8/0x140 Code: 9c 8f 44 24 20 42 80 3c 23 00 74 08 4c 89 f7 e8 4e cb 75 f8 f6 44 24 21 02 75 4e 41 f7 c7 00 02 00 00 74 01 fb bf 01 00 00 00 33 1d 07 f8 65 8b 05 84 31 b9 76 85 c0 74 3f 48 c7 04 24 0e 36 RSP: 0018:ffffc90002dbf6c0 EFLAGS: 00000206 RAX: 0b4420f550946200 RBX: 1ffff920005b7edc RCX: ffffffff815dce6a RDX: dffffc0000000000 RSI: ffffffff898a4420 RDI: 0000000000000001 RBP: ffffc90002dbf750 R08: dffffc0000000000 R09: fffffbfff1d1a61a R10: 0000000000000000 R11: dffffc0000000001 R12: dffffc0000000000 R13: 1ffff920005b7ed8 R14: ffffc90002dbf6e0 R15: 0000000000000246 __wake_up+0x12c/0x1d0 __d_add+0x364/0x720 simple_lookup+0x98/0xd0 path_openat+0xde1/0x2c10 do_filp_open+0x22a/0x440 do_sys_openat2+0x10f/0x430 __x64_sys_openat+0x20d/0x260 do_syscall_64+0x41/0xc0 entry_SYSCALL_64_after_hwframe+0x63/0xcd RIP: 0033:0x7fa43cb25697 Code: 25 00 00 41 00 3d 00 00 41 00 74 37 64 8b 04 25 18 00 00 00 85 c0 75 5b 44 89 e2 48 89 ee bf 9c ff ff ff b8 01 01 00 00 0f 05 <48> 3d 00 f0 ff ff 0f 87 85 00 00 00 48 83 c4 68 5d 41 5c c3 0f 1f RSP: 002b:00007ffec7519d10 EFLAGS: 00000246 ORIG_RAX: 0000000000000101 RAX: ffffffffffffffda RBX: 000055bf70c81040 RCX: 00007fa43cb25697 RDX: 0000000000080141 RSI: 000055bf70c640d8 RDI: 00000000ffffff9c RBP: 000055bf70c640d8 R08: 00000000ffffffff R09: 0000000000000000 R10: 00000000000001a4 R11: 0000000000000246 R12: 0000000000080141 R13: ffffffffffffffff R14: 00000000ffffffff R15: 00000000ffffffff rcu: rcu_preempt kthread starved for 10506 jiffies! g7957 f0x0 RCU_GP_WAIT_FQS(5) ->state=0x0 ->cpu=0 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:26936 pid:16 ppid:2 flags:0x00004000 Call Trace: __schedule+0x1717/0x45f0 schedule+0xc3/0x180 schedule_timeout+0x19e/0x2d0 rcu_gp_fqs_loop+0x2c6/0x1010 rcu_gp_kthread+0xa7/0x3b0 kthread+0x232/0x2b0 ret_from_fork+0x1f/0x30 rcu: Stack dump where RCU GP kthread last ran: CPU: 0 PID: 951 Comm: kworker/u4:4 Not tainted 6.3.0-rc7-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 03/30/2023 Workqueue: events_unbound toggle_allocation_gate RIP: 0010:smp_call_function_many_cond+0x1dbc/0x2e30 Code: 13 84 c0 75 57 41 f7 07 01 00 00 00 75 1a 41 ff c5 41 83 fd 08 48 8b 9c 24 c0 00 00 00 0f 82 22 ff ff ff e9 d4 0e 00 00 f3 90 <0f> b6 04 13 84 c0 75 09 41 8b 07 a8 01 75 ef eb d3 44 89 f9 80 e1 RSP: 0018:ffffc900042ff5c0 EFLAGS: 00000202 RAX: 0000000000000011 RBX: 1ffff110173a854d RCX: 0000000000000000 RDX: dffffc0000000000 RSI: ffffffff898a4420 RDI: ffffffff89d953c0 RBP: ffffc900042ff9c0 R08: dffffc0000000000 R09: fffffbfff1d1a619 R10: 0000000000000000 R11: dffffc0000000001 R12: ffff8880b9c3cf40 R13: 0000000000000001 R14: ffffffff8b2b48a8 R15: ffff8880b9d42a68 FS: 0000000000000000(0000) GS:ffff8880b9c00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007ffec75124f8 CR3: 000000000b726000 CR4: 00000000003506f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: on_each_cpu_cond_mask+0x3a/0x60 text_poke_bp_batch+0x2bf/0x950 text_poke_finish+0x1a/0x30 arch_jump_label_transform_apply+0x17/0x30 static_key_enable_cpuslocked+0xea/0x200 static_key_enable+0x15/0x20 toggle_allocation_gate+0xa7/0x1e0 process_one_work+0x797/0xe20 worker_thread+0x8c9/0xfd0 kthread+0x232/0x2b0 ret_from_fork+0x1f/0x30