audit: type=1804 audit(1581538679.198:70): pid=9500 uid=0 auid=4294967295 ses=4294967295 subj=unconfined_u:system_r:insmod_t:s0-s0:c0.c1023 op=invalid_pcr cause=open_writers comm="syz-executor.3" name="/root/syzkaller-testdir643124219/syzkaller.m8i2jm/42/bus" dev="sda1" ino=16522 res=1 rcu: INFO: rcu_preempt self-detected stall on CPU rcu: 0-...!: (9169 ticks this GP) idle=a6a/1/0x4000000000000002 softirq=16011/16011 fqs=0 rcu: (t=10501 jiffies g=13005 q=659) rcu: rcu_preempt kthread starved for 10502 jiffies! g13005 f0x0 RCU_GP_WAIT_FQS(5) ->state=0x402 ->cpu=1 rcu: RCU grace-period kthread stack dump: rcu_preempt I29088 10 2 0x80000000 Call Trace: context_switch kernel/sched/core.c:2826 [inline] __schedule+0x866/0x1dc0 kernel/sched/core.c:3515 schedule+0x92/0x1c0 kernel/sched/core.c:3559 schedule_timeout+0x4db/0xfc0 kernel/time/timer.c:1806 rcu_gp_kthread+0xd4e/0x21c0 kernel/rcu/tree.c:2202 kthread+0x354/0x420 kernel/kthread.c:246 ret_from_fork+0x24/0x30 arch/x86/entry/entry_64.S:415 NMI backtrace for cpu 0 CPU: 0 PID: 9500 Comm: syz-executor.3 Not tainted 4.19.103-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Call Trace: __dump_stack lib/dump_stack.c:77 [inline] dump_stack+0x197/0x210 lib/dump_stack.c:118 nmi_cpu_backtrace.cold+0x63/0xa4 lib/nmi_backtrace.c:101 nmi_trigger_cpumask_backtrace+0x1b0/0x1f8 lib/nmi_backtrace.c:62 arch_trigger_cpumask_backtrace+0x14/0x20 arch/x86/kernel/apic/hw_nmi.c:38 trigger_single_cpu_backtrace include/linux/nmi.h:164 [inline] rcu_dump_cpu_stacks+0x189/0x1d5 kernel/rcu/tree.c:1340 print_cpu_stall kernel/rcu/tree.c:1478 [inline] check_cpu_stall kernel/rcu/tree.c:1550 [inline] __rcu_pending kernel/rcu/tree.c:3293 [inline] rcu_pending kernel/rcu/tree.c:3336 [inline] rcu_check_callbacks.cold+0x5f2/0xdbb kernel/rcu/tree.c:2682 update_process_times+0x32/0x80 kernel/time/timer.c:1638 tick_sched_handle+0xa2/0x190 kernel/time/tick-sched.c:168 tick_sched_timer+0x47/0x130 kernel/time/tick-sched.c:1278 __run_hrtimer kernel/time/hrtimer.c:1401 [inline] __hrtimer_run_queues+0x33b/0xdc0 kernel/time/hrtimer.c:1463 hrtimer_interrupt+0x314/0x770 kernel/time/hrtimer.c:1521 local_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1067 [inline] smp_apic_timer_interrupt+0x111/0x550 arch/x86/kernel/apic/apic.c:1092 apic_timer_interrupt+0xf/0x20 arch/x86/entry/entry_64.S:893 RIP: 0010:arch_local_irq_restore arch/x86/include/asm/paravirt.h:789 [inline] RIP: 0010:slab_alloc mm/slab.c:3390 [inline] RIP: 0010:__do_kmalloc mm/slab.c:3725 [inline] RIP: 0010:__kmalloc+0x2ba/0x750 mm/slab.c:3736 Code: 7e 0f 85 cb fe ff ff e8 75 fb 5d ff e9 c1 fe ff ff e8 5a fe cd ff 48 83 3d ca eb 4f 07 00 0f 84 11 03 00 00 48 8b 7d c0 57 9d <0f> 1f 44 00 00 e9 5c fe ff ff 31 d2 be a6 01 00 00 48 c7 c7 9a 39 RSP: 0018:ffff88804dfe78c0 EFLAGS: 00000282 ORIG_RAX: ffffffffffffff13 RAX: 0000000000000007 RBX: 00000000006080c0 RCX: 1ffff11009c01de4 RDX: 0000000000000000 RSI: ffff88804e00ef00 RDI: 0000000000000282 RBP: ffff88804dfe7938 R08: ffff88804e00e680 R09: ffff88804e00ef20 R10: 0000000000000000 R11: 0000000000000000 R12: ffff88808ec47440 R13: 0000000000000100 R14: 00000000006080c0 R15: ffff88812c31c7c0 kmalloc_array include/linux/slab.h:637 [inline] kcalloc include/linux/slab.h:648 [inline] iter_file_splice_write+0x16e/0xbd0 fs/splice.c:693 do_splice_from fs/splice.c:852 [inline] direct_splice_actor+0x123/0x190 fs/splice.c:1025 splice_direct_to_actor+0x367/0x970 fs/splice.c:980 do_splice_direct+0x1da/0x2a0 fs/splice.c:1068 do_sendfile+0x597/0xce0 fs/read_write.c:1447 __do_sys_sendfile64 fs/read_write.c:1508 [inline] __se_sys_sendfile64 fs/read_write.c:1494 [inline] __x64_sys_sendfile64+0x1dd/0x220 fs/read_write.c:1494 do_syscall_64+0xfd/0x620 arch/x86/entry/common.c:293 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x45b3b9 Code: ad b6 fb ff c3 66 2e 0f 1f 84 00 00 00 00 00 66 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 0f 83 7b b6 fb ff c3 66 2e 0f 1f 84 00 00 00 00 RSP: 002b:00007fd930ed1c78 EFLAGS: 00000246 ORIG_RAX: 0000000000000028 RAX: ffffffffffffffda RBX: 00007fd930ed26d4 RCX: 000000000045b3b9 RDX: 0000000000000000 RSI: 0000000000000007 RDI: 0000000000000005 RBP: 000000000075bf20 R08: 0000000000000000 R09: 0000000000000000 R10: 00008400fffffffb R11: 0000000000000246 R12: 00000000ffffffff R13: 00000000000008cb R14: 00000000004ca26f R15: 000000000075bf2c Sending NMI from CPU 0 to CPUs 1: NMI backtrace for cpu 1 CPU: 1 PID: 7 Comm: kworker/u4:0 Not tainted 4.19.103-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Workqueue: writeback wb_workfn (flush-8:0) RIP: 0010:__sanitizer_cov_trace_const_cmp4+0x0/0x20 kernel/kcov.c:187 Code: f6 fe ff ff 5d c3 0f 1f 40 00 55 0f b7 d6 0f b7 f7 bf 03 00 00 00 48 89 e5 48 8b 4d 08 e8 d8 fe ff ff 5d c3 66 0f 1f 44 00 00 <55> 89 f2 89 fe bf 05 00 00 00 48 89 e5 48 8b 4d 08 e8 ba fe ff ff RSP: 0018:ffff8880aa35ecb8 EFLAGS: 00000202 RAX: ffff8880aa34c1c0 RBX: 1ffff1101546bd9c RCX: ffffffff8160c43c RDX: 0000000000000000 RSI: 0000000000000001 RDI: 0000000000000000 RBP: ffff8880aa35ed88 R08: ffff8880aa34c1c0 R09: ffffed1015d05a89 R10: ffffed1015d05a88 R11: ffff8880ae82d447 R12: 0000000000000001 R13: 0000000000000000 R14: 0000000000000001 R15: 0000000000000001 FS: 0000000000000000(0000) GS:ffff8880ae900000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: ffffffffff600400 CR3: 0000000008e6d000 CR4: 00000000001406e0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: smp_call_function_many+0x75f/0x8e0 kernel/smp.c:434 native_flush_tlb_others+0x81/0x420 arch/x86/mm/tlb.c:673 flush_tlb_others arch/x86/include/asm/paravirt.h:309 [inline] flush_tlb_mm_range+0x21c/0x350 arch/x86/mm/tlb.c:722 flush_tlb_page arch/x86/include/asm/tlbflush.h:576 [inline] ptep_clear_flush+0x13b/0x170 mm/pgtable-generic.c:87 page_mkclean_one+0x2bc/0x5e0 mm/rmap.c:915 rmap_walk_file+0x54c/0xd10 mm/rmap.c:1887 rmap_walk+0x130/0x1c0 mm/rmap.c:1905 page_mkclean+0x25c/0x330 mm/rmap.c:984 clear_page_dirty_for_io+0x345/0xff0 mm/page-writeback.c:2687 mpage_submit_page+0x8d/0x270 fs/ext4/inode.c:2207 mpage_process_page_bufs+0x517/0x610 fs/ext4/inode.c:2337 mpage_prepare_extent_to_map+0xa86/0x1110 fs/ext4/inode.c:2699 ext4_writepages+0x119b/0x3450 fs/ext4/inode.c:2827 do_writepages+0xf3/0x2a0 mm/page-writeback.c:2344 __writeback_single_inode+0x11d/0x12c0 fs/fs-writeback.c:1370 writeback_sb_inodes+0x596/0xe90 fs/fs-writeback.c:1634 __writeback_inodes_wb+0xc3/0x260 fs/fs-writeback.c:1703 wb_writeback+0x872/0xcf0 fs/fs-writeback.c:1812 wb_check_old_data_flush fs/fs-writeback.c:1914 [inline] wb_do_writeback fs/fs-writeback.c:1967 [inline] wb_workfn+0xb36/0x1190 fs/fs-writeback.c:1996 process_one_work+0x989/0x1750 kernel/workqueue.c:2153 worker_thread+0x98/0xe40 kernel/workqueue.c:2296 kthread+0x354/0x420 kernel/kthread.c:246 ret_from_fork+0x24/0x30 arch/x86/entry/entry_64.S:415 audit: type=1804 audit(1581538679.638:71): pid=9499 uid=0 auid=4294967295 ses=4294967295 subj=unconfined_u:system_r:insmod_t:s0-s0:c0.c1023 op=invalid_pcr cause=open_writers comm="syz-executor.1" name="/root/syzkaller-testdir633473181/syzkaller.jwKG6F/46/bus" dev="sda1" ino=16629 res=1 audit: type=1804 audit(1581538680.788:72): pid=9503 uid=0 auid=4294967295 ses=4294967295 subj=unconfined_u:system_r:insmod_t:s0-s0:c0.c1023 op=invalid_pcr cause=open_writers comm="syz-executor.0" name="/root/syzkaller-testdir504075748/syzkaller.BMDBev/48/bus" dev="sda1" ino=16697 res=1 syz-executor.0 (8354) used greatest stack depth: 22608 bytes left IPVS: ftp: loaded support on port[0] = 21 chnl_net:caif_netlink_parms(): no params data found IPVS: ftp: loaded support on port[0] = 21 bridge0: port 1(bridge_slave_0) entered blocking state bridge0: port 1(bridge_slave_0) entered disabled state device bridge_slave_0 entered promiscuous mode bridge0: port 2(bridge_slave_1) entered blocking state bridge0: port 2(bridge_slave_1) entered disabled state device bridge_slave_1 entered promiscuous mode bond0: Enslaving bond_slave_0 as an active interface with an up link bond0: Enslaving bond_slave_1 as an active interface with an up link IPv6: ADDRCONF(NETDEV_UP): team_slave_0: link is not ready team0: Port device team_slave_0 added IPv6: ADDRCONF(NETDEV_UP): team_slave_1: link is not ready team0: Port device team_slave_1 added batman_adv: batadv0: Adding interface: batadv_slave_0 batman_adv: batadv0: The MTU of interface batadv_slave_0 is too small (1500) to handle the transport of batman-adv packets. Packets going over this interface will be fragmented on layer2 which could impact the performance. Setting the MTU to 1560 would solve the problem. batman_adv: batadv0: Not using interface batadv_slave_0 (retrying later): interface not active batman_adv: batadv0: Interface deactivated: batadv_slave_0 batman_adv: batadv0: Removing interface: batadv_slave_0 batman_adv: batadv0: Interface deactivated: batadv_slave_1 batman_adv: batadv0: Removing interface: batadv_slave_1 device bridge_slave_1 left promiscuous mode bridge0: port 2(bridge_slave_1) entered disabled state device bridge_slave_0 left promiscuous mode bridge0: port 1(bridge_slave_0) entered disabled state device veth1_macvtap left promiscuous mode device veth0_macvtap left promiscuous mode device veth1_vlan left promiscuous mode device veth0_vlan left promiscuous mode