./strace-static-x86_64 -e \!wait4,clock_nanosleep,nanosleep -s 100 -x -f ./syz-executor1550699848 <...> syzkaller syzkaller login: [ 6.090678][ T0] NOHZ tick-stop error: Non-RCU local softirq work is pending, handler #08!!! [ 11.511916][ T24] kauditd_printk_skb: 60 callbacks suppressed [ 11.511926][ T24] audit: type=1400 audit(1661185498.980:71): avc: denied { transition } for pid=290 comm="sshd" path="/bin/sh" dev="sda1" ino=73 scontext=system_u:system_r:initrc_t tcontext=root:sysadm_r:sysadm_t tclass=process permissive=1 [ 11.519286][ T24] audit: type=1400 audit(1661185498.980:72): avc: denied { write } for pid=290 comm="sh" path="pipe:[1332]" dev="pipefs" ino=1332 scontext=root:sysadm_r:sysadm_t tcontext=system_u:system_r:initrc_t tclass=fifo_file permissive=1 [ 12.640652][ T0] NOHZ tick-stop error: Non-RCU local softirq work is pending, handler #08!!! [ 12.740855][ T0] NOHZ tick-stop error: Non-RCU local softirq work is pending, handler #08!!! [ 12.744217][ T0] NOHZ tick-stop error: Non-RCU local softirq work is pending, handler #08!!! [ 14.380511][ T0] NOHZ tick-stop error: Non-RCU local softirq work is pending, handler #80!!! Warning: Permanently added '10.128.1.78' (ECDSA) to the list of known hosts. execve("./syz-executor1550699848", ["./syz-executor1550699848"], 0x7ffc5057ab50 /* 10 vars */) = 0 brk(NULL) = 0x555555774000 brk(0x555555774c40) = 0x555555774c40 arch_prctl(ARCH_SET_FS, 0x555555774300) = 0 uname({sysname="Linux", nodename="syzkaller", ...}) = 0 readlink("/proc/self/exe", "/root/syz-executor1550699848", 4096) = 28 brk(0x555555795c40) = 0x555555795c40 brk(0x555555796000) = 0x555555796000 mprotect(0x7ff15ec4e000, 16384, PROT_READ) = 0 mmap(0x1ffff000, 4096, PROT_NONE, MAP_PRIVATE|MAP_FIXED|MAP_ANONYMOUS, -1, 0) = 0x1ffff000 mmap(0x20000000, 16777216, PROT_READ|PROT_WRITE|PROT_EXEC, MAP_PRIVATE|MAP_FIXED|MAP_ANONYMOUS, -1, 0) = 0x20000000 mmap(0x21000000, 4096, PROT_NONE, MAP_PRIVATE|MAP_FIXED|MAP_ANONYMOUS, -1, 0) = 0x21000000 mkdir("./file0", 000) = 0 creat("./file0/file0", 054517) = 3 mount("./file0", "./file0", "incremental-fs", 0, NULL) = 0 [ 19.041455][ T24] audit: type=1400 audit(1661185506.510:73): avc: denied { execmem } for pid=371 comm="syz-executor155" scontext=root:sysadm_r:sysadm_t tcontext=root:sysadm_r:sysadm_t tclass=process permissive=1 [ 19.045862][ T371] ------------[ cut here ]------------ [ 19.060875][ T24] audit: type=1400 audit(1661185506.510:74): avc: denied { mounton } for pid=371 comm="syz-executor155" path="/root/file0" dev="sda1" ino=1138 scontext=root:sysadm_r:sysadm_t tcontext=root:object_r:user_home_t tclass=dir permissive=1 [ 19.060890][ T24] audit: type=1400 audit(1661185506.510:75): avc: denied { mount } for pid=371 comm="syz-executor155" name="/" dev="incremental-fs" ino=1138 scontext=root:sysadm_r:sysadm_t tcontext=system_u:object_r:unlabeled_t tclass=filesystem permissive=1 [ 19.060903][ T24] audit: type=1400 audit(1661185506.510:76): avc: denied { setattr } for pid=371 comm="syz-executor155" name="file0" dev="incremental-fs" ino=1139 scontext=root:sysadm_r:sysadm_t tcontext=system_u:object_r:unlabeled_t tclass=file permissive=1 [ 19.135885][ T371] kernel BUG at fs/attr.c:289! [ 19.140668][ T371] invalid opcode: 0000 [#1] PREEMPT SMP KASAN [ 19.146758][ T371] CPU: 1 PID: 371 Comm: syz-executor155 Not tainted 5.10.136-syzkaller-01853-gee965fe12def #0 [ 19.156962][ T371] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/22/2022 [ 19.167006][ T371] RIP: 0010:notify_change+0xe02/0xe10 [ 19.172369][ T371] Code: f0 ff e9 83 fb ff ff 44 89 e1 80 e1 07 80 c1 03 38 c1 0f 8c 82 f7 ff ff 4c 89 e7 e8 38 95 f0 ff e9 75 f7 ff ff e8 4e 8e b6 ff <0f> 0b 66 66 2e 0f 1f 84 00 00 00 00 00 90 55 48 89 e5 41 57 41 56 [ 19.191947][ T371] RSP: 0018:ffffc90000bc7b48 EFLAGS: 00010293 [ 19.197990][ T371] RAX: ffffffff81b637f2 RBX: 0000000000001847 RCX: ffff88811e158000 [ 19.205937][ T371] RDX: 0000000000000000 RSI: 0000000000000001 RDI: 0000000000000000 [ 19.213887][ T371] RBP: ffffc90000bc7bc8 R08: ffffffff81b62f9d R09: ffffc90000bc7ac0 [ 19.221834][ T371] R10: fffff52000178f5a R11: 1ffff92000178f58 R12: ffffc90000bc7d60 [ 19.229782][ T371] R13: 0000000000000001 R14: ffff88811a555770 R15: dffffc0000000000 [ 19.237732][ T371] FS: 0000555555774300(0000) GS:ffff8881f7100000(0000) knlGS:0000000000000000 [ 19.246633][ T371] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 19.253208][ T371] CR2: 0000000020001ac0 CR3: 000000010699f000 CR4: 00000000003506a0 [ 19.261155][ T371] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 19.269117][ T371] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 19.277064][ T371] Call Trace: [ 19.280338][ T371] incfs_setattr+0x229/0x3a0 [ 19.284905][ T371] ? file_release+0x180/0x180 [ 19.289582][ T371] notify_change+0xb76/0xe10 [ 19.294151][ T371] chown_common+0x3a1/0x660 [ 19.298642][ T371] ? __ia32_sys_chmod+0x190/0x190 [ 19.303649][ T371] ? mnt_want_write+0x1b8/0x290 [ 19.308478][ T371] do_fchownat+0x175/0x250 [ 19.312871][ T371] ? chown_common+0x660/0x660 [ 19.317529][ T371] ? debug_smp_processor_id+0x17/0x20 [ 19.322878][ T371] ? fpregs_assert_state_consistent+0xb6/0xe0 [ 19.328921][ T371] __x64_sys_lchown+0x85/0x90 [ 19.333588][ T371] do_syscall_64+0x34/0x70 [ 19.337988][ T371] entry_SYSCALL_64_after_hwframe+0x61/0xc6 [ 19.343860][ T371] RIP: 0033:0x7ff15ebe1ba9 [ 19.348267][ T371] Code: 28 c3 e8 2a 14 00 00 66 2e 0f 1f 84 00 00 00 00 00 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 c0 ff ff ff f7 d8 64 89 01 48 [ 19.367853][ T371] RSP: 002b:00007ffd60fc9c78 EFLAGS: 00000246 ORIG_RAX: 000000000000005e [ 19.376244][ T371] RAX: ffffffffffffffda RBX: 0030656c69662f2e RCX: 00007ff15ebe1ba9 [ 19.384195][ T371] RDX: 000000000000ee01 RSI: 0000000000000000 RDI: 0000000020001ac0 [ 19.392141][ T371] RBP: 2f30656c69662f2e R08: 0000000000000000 R09: 0000000000000000 [ 19.400091][ T371] R10: 0000000000000000 R11: 0000000000000246 R12: 00007ff15eba5de0 [ 19.408041][ T371] R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000 [ 19.415989][ T371] Modules linked in: [ 19.419968][ T371] ---[ end trace 0d95c96a85df13ba ]--- [ 19.425465][ T371] RIP: 0010:notify_change+0xe02/0xe10 [ 19.430879][ T371] Code: f0 ff e9 83 fb ff ff 44 89 e1 80 e1 07 80 c1 03 38 c1 0f 8c 82 f7 ff ff 4c 89 e7 e8 38 95 f0 ff e9 75 f7 ff ff e8 4e 8e b6 ff <0f> 0b 66 66 2e 0f 1f 84 00 00 00 00 00 90 55 48 89 e5 41 57 41 56 [ 19.450490][ T371] RSP: 0018:ffffc90000bc7b48 EFLAGS: 00010293 [ 19.456632][ T371] RAX: ffffffff81b637f2 RBX: 0000000000001847 RCX: ffff88811e158000 [ 19.464624][ T371] RDX: 0000000000000000 RSI: 0000000000000001 RDI: 0000000000000000 [ 19.472593][ T371] RBP: ffffc90000bc7bc8 R08: ffffffff81b62f9d R09: ffffc90000bc7ac0 [ 19.480569][ T371] R10: fffff52000178f5a R11: 1ffff92000178f58 R12: ffffc90000bc7d60 [ 19.488525][ T371] R13: 0000000000000001 R14: ffff88811a555770 R15: dffffc0000000000 [ 19.496501][ T371] FS: 0000555555774300(0000) GS:ffff8881f7100000(0000) knlGS:0000000000000000 [ 19.505424][ T371] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 19.512018][ T371] CR2: 0000000020001ac0 CR3: 000000010699f000 CR4: 00000000003506a0 [ 19.519972][ T371] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 19.527960][ T371] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 19.535925][ T371] Kernel panic - not syncing: Fatal exception [ 19.542070][ T371] Kernel Offset: disabled [ 19.546379][ T371] Rebooting in 86400 seconds..