syzkaller
syzkaller login: [ 11.704589][ T30] kauditd_printk_skb: 27 callbacks suppressed
[ 11.704604][ T30] audit: type=1400 audit(1748878848.470:59): avc: denied { transition } for pid=221 comm="sshd-session" path="/bin/sh" dev="sda1" ino=90 scontext=system_u:system_r:sshd_t tcontext=root:sysadm_r:sysadm_t tclass=process permissive=1
[ 11.714637][ T30] audit: type=1400 audit(1748878848.470:60): avc: denied { noatsecure } for pid=221 comm="sshd-session" scontext=system_u:system_r:sshd_t tcontext=root:sysadm_r:sysadm_t tclass=process permissive=1
[ 11.721445][ T30] audit: type=1400 audit(1748878848.470:61): avc: denied { write } for pid=221 comm="sh" path="pipe:[14680]" dev="pipefs" ino=14680 scontext=root:sysadm_r:sysadm_t tcontext=system_u:system_r:sshd_t tclass=fifo_file permissive=1
[ 11.726769][ T30] audit: type=1400 audit(1748878848.470:62): avc: denied { rlimitinh } for pid=221 comm="sh" scontext=system_u:system_r:sshd_t tcontext=root:sysadm_r:sysadm_t tclass=process permissive=1
[ 11.730440][ T30] audit: type=1400 audit(1748878848.470:63): avc: denied { siginh } for pid=221 comm="sh" scontext=system_u:system_r:sshd_t tcontext=root:sysadm_r:sysadm_t tclass=process permissive=1
[ 265.533251][ T270] sshd-session (270) used greatest stack depth: 20960 bytes left
Warning: Permanently added '10.128.1.157' (ED25519) to the list of known hosts.
executing program
executing program
executing program
[ 272.245335][ T30] audit: type=1400 audit(1748879109.010:64): avc: denied { execmem } for pid=283 comm="syz-executor163" scontext=root:sysadm_r:sysadm_t tcontext=root:sysadm_r:sysadm_t tclass=process permissive=1
[ 372.283780][ C1] rcu: INFO: rcu_preempt detected stalls on CPUs/tasks:
[ 372.290786][ C1] (detected by 1, t=10002 jiffies, g=697, q=229)
[ 372.297198][ C1] rcu: All QSes seen, last rcu_preempt kthread activity 10003 (4294974451-4294964448), jiffies_till_next_fqs=1, root ->qsmask 0x0
[ 372.310570][ C1] rcu: rcu_preempt kthread starved for 10004 jiffies! g697 f0x2 RCU_GP_WAIT_FQS(5) ->state=0x0 ->cpu=1
[ 372.321594][ C1] rcu: Unless rcu_preempt kthread gets sufficient CPU time, OOM is now expected behavior.
[ 372.331564][ C1] rcu: RCU grace-period kthread stack dump:
[ 372.337455][ C1] task:rcu_preempt state:R running task stack:28752 pid: 14 ppid: 2 flags:0x00004000
[ 372.348242][ C1] Call Trace:
[ 372.351521][ C1]
[ 372.354452][ C1] __schedule+0xb6e/0x14c0
[ 372.358886][ C1] ? release_firmware_map_entry+0x190/0x190
[ 372.364783][ C1] ? _raw_spin_unlock_irqrestore+0x5b/0x80
[ 372.370595][ C1] ? __mod_timer+0x7ae/0xb30
[ 372.375207][ C1] schedule+0x11e/0x1e0
[ 372.379369][ C1] schedule_timeout+0x12c/0x2e0
[ 372.384231][ C1] ? console_conditional_schedule+0x30/0x30
[ 372.390171][ C1] ? update_process_times+0x200/0x200
[ 372.395675][ C1] ? prepare_to_swait_event+0x308/0x320
[ 372.401245][ C1] rcu_gp_fqs_loop+0x293/0xf60
[ 372.406031][ C1] ? debug_smp_processor_id+0x17/0x20
[ 372.411424][ C1] ? __note_gp_changes+0x4e2/0x9e0
[ 372.416554][ C1] ? rcu_gp_init+0xc00/0xc00
[ 372.421154][ C1] ? _raw_spin_unlock_irq+0x4e/0x70
[ 372.426364][ C1] ? rcu_gp_init+0x9a7/0xc00
[ 372.430971][ C1] rcu_gp_kthread+0x98/0x330
[ 372.435565][ C1] ? wake_nocb_gp+0x1d0/0x1d0
[ 372.440250][ C1] ? __kasan_check_read+0x11/0x20
[ 372.445293][ C1] ? __kthread_parkme+0xac/0x200
[ 372.450248][ C1] ? preempt_count_add+0x90/0x1b0
[ 372.455281][ C1] kthread+0x411/0x500
[ 372.459365][ C1] ? wake_nocb_gp+0x1d0/0x1d0
[ 372.464047][ C1] ? kthread_blkcg+0xd0/0xd0
[ 372.468758][ C1] ret_from_fork+0x1f/0x30
[ 372.473186][ C1]
[ 372.476217][ C1] rcu: Stack dump where RCU GP kthread last ran:
[ 372.482554][ C1] NMI backtrace for cpu 1
[ 372.486895][ C1] CPU: 1 PID: 296 Comm: syz-executor163 Not tainted 5.15.184-syzkaller-00129-g4032a894ccb2 #0
[ 372.497131][ C1] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/07/2025
[ 372.507190][ C1] Call Trace:
[ 372.510586][ C1]
[ 372.513437][ C1] __dump_stack+0x21/0x30
[ 372.517783][ C1] dump_stack_lvl+0xee/0x150
[ 372.522386][ C1] ? show_regs_print_info+0x20/0x20
[ 372.527603][ C1] dump_stack+0x15/0x20
[ 372.531779][ C1] nmi_cpu_backtrace+0x2b4/0x2c0
[ 372.536722][ C1] ? nmi_trigger_cpumask_backtrace+0x240/0x240
[ 372.542888][ C1] ? load_image+0x3a0/0x3a0
[ 372.547402][ C1] ? arch_trigger_cpumask_backtrace+0x20/0x20
[ 372.553478][ C1] ? arch_trigger_cpumask_backtrace+0x20/0x20
[ 372.559570][ C1] nmi_trigger_cpumask_backtrace+0x138/0x240
[ 372.565575][ C1] arch_trigger_cpumask_backtrace+0x10/0x20
[ 372.571476][ C1] rcu_check_gp_kthread_starvation+0x1e0/0x260
[ 372.577653][ C1] print_other_cpu_stall+0xded/0xfd0
[ 372.582971][ C1] ? print_cpu_stall+0x600/0x600
[ 372.587964][ C1] ? kick_process+0xdc/0x150
[ 372.592569][ C1] ? complete_signal+0x69f/0xd00
[ 372.597516][ C1] rcu_sched_clock_irq+0x8a3/0x12b0
[ 372.602719][ C1] ? rcu_boost_kthread_setaffinity+0x310/0x310
[ 372.608879][ C1] ? hrtimer_run_queues+0x166/0x430
[ 372.614081][ C1] update_process_times+0x198/0x200
[ 372.619280][ C1] tick_sched_timer+0x17c/0x240
[ 372.624135][ C1] ? tick_setup_sched_timer+0x450/0x450
[ 372.629685][ C1] __hrtimer_run_queues+0x3b5/0x9e0
[ 372.634894][ C1] ? hrtimer_interrupt+0x8c0/0x8c0
[ 372.640712][ C1] ? ktime_get_update_offsets_now+0x2fa/0x310
[ 372.646791][ C1] hrtimer_interrupt+0x3c7/0x8c0
[ 372.651764][ C1] __sysvec_apic_timer_interrupt+0xfa/0x3e0
[ 372.657667][ C1] sysvec_apic_timer_interrupt+0xa4/0xc0
[ 372.663314][ C1]
[ 372.666253][ C1]
[ 372.669191][ C1] asm_sysvec_apic_timer_interrupt+0x1b/0x20
[ 372.675198][ C1] RIP: 0010:_raw_spin_unlock_irq+0x49/0x70
[ 372.681037][ C1] Code: 12 48 89 fb 48 c7 c7 38 3a 6d 86 e8 c1 b1 01 fd 48 89 df 48 83 3d 7e d5 c7 01 00 74 27 e8 33 b5 a9 fc 66 90 fb bf 01 00 00 00 32 9d a1 fc 65 8b 05 b3 08 5d 7b 85 c0 74 03 5b 5d c3 e8 d3 11
[ 372.700650][ C1] RSP: 0018:ffffc90000ad7b98 EFLAGS: 00000246
[ 372.706731][ C1] RAX: 0000000000000001 RBX: 0000000000000021 RCX: dffffc0000000000
[ 372.714710][ C1] RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000001
[ 372.722689][ C1] RBP: ffffc90000ad7ba0 R08: dffffc0000000000 R09: fffff5200015afc0
[ 372.730680][ C1] R10: fffff5200015afc0 R11: 1ffff9200015afbc R12: 1ffff1102175c4e4
[ 372.738660][ C1] R13: dffffc0000000000 R14: ffff88810bae2720 R15: 000000001c000004
[ 372.746642][ C1] ? _raw_spin_unlock_irq+0x41/0x70
[ 372.751867][ C1] get_signal+0x13b2/0x1480
[ 372.756383][ C1] arch_do_signal_or_restart+0xc1/0x10f0
[ 372.762033][ C1] ? load_gs_index+0xb0/0xb0
[ 372.766638][ C1] ? get_sigframe_size+0x10/0x10
[ 372.771590][ C1] ? sched_clock+0x9/0x10
[ 372.775929][ C1] ? sched_clock_cpu+0x18/0x3c0
[ 372.780788][ C1] exit_to_user_mode_loop+0xa7/0xe0
[ 372.785996][ C1] exit_to_user_mode_prepare+0x5a/0xa0
[ 372.791462][ C1] syscall_exit_to_user_mode+0x1a/0x30
[ 372.796930][ C1] do_syscall_64+0x58/0xa0
[ 372.801359][ C1] ? clear_bhb_loop+0x50/0xa0
[ 372.806036][ C1] ? clear_bhb_loop+0x50/0xa0
[ 372.810723][ C1] entry_SYSCALL_64_after_hwframe+0x66/0xd0
[ 372.816624][ C1] RIP: 0033:0x7f1b92665c47
[ 372.821061][ C1] Code: 14 25 28 00 00 00 75 05 48 83 c4 28 c3 e8 81 18 00 00 90 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 <0f> 05 48 3d 01 f0 ff ff 73 01 c3 48 c7 c1 b0 ff ff ff f7 d8 64 89
[ 372.840664][ C1] RSP: 002b:00007f1b92626218 EFLAGS: 00000246
[ 372.846733][ C1] RAX: 00000000000000ca RBX: 00007f1b926f03c8 RCX: 00007f1b92665c49
[ 372.854723][ C1] RDX: 0000000000000000 RSI: 0000000000000080 RDI: 00007f1b926f03c8
[ 372.862696][ C1] RBP: 00007f1b926f03c0 R08: 0000000000000000 R09: 0000000000000000
[ 372.870671][ C1] R10: 0000000000000000 R11: 0000000000000246 R12: 0000200000000140
[ 372.878642][ C1] R13: 000020000006b000 R14: 0000200000bbdffc R15: 0000200000000240
[ 372.886622][ C1]
[ 428.743772][ C0] BUG: workqueue lockup - pool cpus=0 node=0 flags=0x0 nice=0 stuck for 155s!
[ 428.752723][ C0] Showing busy workqueues and worker pools:
[ 428.758654][ C0] workqueue events: flags=0x0
[ 428.763334][ C0] pwq 2: cpus=1 node=0 flags=0x0 nice=0 active=1/256 refcnt=2
[ 428.763377][ C0] pending: psi_avgs_work
[ 428.763405][ C0] pwq 0: cpus=0 node=0 flags=0x0 nice=0 active=1/256 refcnt=2
[ 428.763442][ C0] pending: vmstat_shepherd
[ 428.763466][ C0] workqueue events_unbound: flags=0x2
[ 428.793576][ C0] pwq 4: cpus=0-1 flags=0x4 nice=0 active=2/512 refcnt=4
[ 428.793616][ C0] pending: toggle_allocation_gate, flush_memcg_stats_dwork
[ 428.793662][ C0] workqueue events_power_efficient: flags=0x80
[ 428.814577][ C0] pwq 0: cpus=0 node=0 flags=0x0 nice=0 active=4/256 refcnt=5
[ 428.814619][ C0] pending: neigh_periodic_work, neigh_periodic_work, gc_worker, check_lifetime
[ 428.814686][ C0] workqueue mm_percpu_wq: flags=0x8
[ 428.836819][ C0] pwq 2: cpus=1 node=0 flags=0x0 nice=0 active=1/256 refcnt=2
[ 428.836865][ C0] pending: vmstat_update
[ 428.836891][ C0] pwq 0: cpus=0 node=0 flags=0x0 nice=0 active=1/256 refcnt=2
[ 428.836929][ C0] pending: vmstat_update
[ 428.836954][ C0] workqueue writeback: flags=0x4a
[ 428.866893][ C0] pwq 4: cpus=0-1 flags=0x4 nice=0 active=1/256 refcnt=3
[ 428.866937][ C0] pending: wb_workfn
[ 428.867070][ C0] workqueue dm_bufio_cache: flags=0x8
[ 428.883996][ C0] pwq 2: cpus=1 node=0 flags=0x0 nice=0 active=1/256 refcnt=2
[ 428.884038][ C0] pending: work_fn
[ 428.884090][ C0] workqueue ipv6_addrconf: flags=0x40008
[ 428.901418][ C0] pwq 0: cpus=0 node=0 flags=0x0 nice=0 active=1/1 refcnt=2
[ 428.901459][ C0] pending: addrconf_verify_work