syzkaller syzkaller login: [ 16.873823][ T25] kauditd_printk_skb: 64 callbacks suppressed [ 16.873838][ T25] audit: type=1400 audit(1684075915.936:76): avc: denied { transition } for pid=2920 comm="sshd" path="/bin/sh" dev="sda1" ino=89 scontext=system_u:system_r:sshd_t tcontext=root:sysadm_r:sysadm_t tclass=process permissive=1 [ 16.878019][ T25] audit: type=1400 audit(1684075915.936:77): avc: denied { noatsecure } for pid=2920 comm="sshd" scontext=system_u:system_r:sshd_t tcontext=root:sysadm_r:sysadm_t tclass=process permissive=1 [ 16.880734][ T25] audit: type=1400 audit(1684075915.936:78): avc: denied { write } for pid=2920 comm="sh" path="pipe:[15296]" dev="pipefs" ino=15296 scontext=root:sysadm_r:sysadm_t tcontext=system_u:system_r:sshd_t tclass=fifo_file permissive=1 [ 16.884156][ T25] audit: type=1400 audit(1684075915.936:79): avc: denied { rlimitinh } for pid=2920 comm="sh" scontext=system_u:system_r:sshd_t tcontext=root:sysadm_r:sysadm_t tclass=process permissive=1 [ 16.886908][ T25] audit: type=1400 audit(1684075915.936:80): avc: denied { siginh } for pid=2920 comm="sh" scontext=system_u:system_r:sshd_t tcontext=root:sysadm_r:sysadm_t tclass=process permissive=1 [ 18.468988][ T2925] scp (2925) used greatest stack depth: 11776 bytes left Warning: Permanently added '10.128.0.55' (ECDSA) to the list of known hosts. 2023/05/14 14:52:03 fuzzer started 2023/05/14 14:52:03 dialing manager at 10.128.0.163:42365 [ 24.658097][ T25] audit: type=1400 audit(1684075923.726:81): avc: denied { mounton } for pid=3042 comm="syz-executor" path="/syzcgroup/unified" dev="sda1" ino=1925 scontext=root:sysadm_r:sysadm_t tcontext=root:object_r:root_t tclass=dir permissive=1 [ 24.668554][ T3042] cgroup: Unknown subsys name 'net' [ 24.680850][ T25] audit: type=1400 audit(1684075923.736:82): avc: denied { mount } for pid=3042 comm="syz-executor" name="/" dev="cgroup2" ino=1 scontext=root:sysadm_r:sysadm_t tcontext=system_u:object_r:cgroup_t tclass=filesystem permissive=1 [ 24.708299][ T25] audit: type=1400 audit(1684075923.746:83): avc: denied { unmount } for pid=3042 comm="syz-executor" scontext=root:sysadm_r:sysadm_t tcontext=system_u:object_r:cgroup_t tclass=filesystem permissive=1 [ 24.858897][ T3042] cgroup: Unknown subsys name 'rlimit' [ 24.948266][ T25] audit: type=1400 audit(1684075924.016:84): avc: denied { mounton } for pid=3042 comm="syz-executor" path="/proc/sys/fs/binfmt_misc" dev="binfmt_misc" ino=1 scontext=root:sysadm_r:sysadm_t tcontext=system_u:object_r:binfmt_misc_fs_t tclass=dir permissive=1 [ 24.973278][ T25] audit: type=1400 audit(1684075924.046:85): avc: denied { mount } for pid=3042 comm="syz-executor" name="/" dev="binfmt_misc" ino=1 scontext=root:sysadm_r:sysadm_t tcontext=system_u:object_r:binfmt_misc_fs_t tclass=filesystem permissive=1 2023/05/14 14:52:04 syscalls: 2854 2023/05/14 14:52:04 code coverage: enabled 2023/05/14 14:52:04 comparison tracing: enabled 2023/05/14 14:52:04 extra coverage: enabled 2023/05/14 14:52:04 delay kcov mmap: enabled 2023/05/14 14:52:04 setuid sandbox: enabled 2023/05/14 14:52:04 namespace sandbox: enabled 2023/05/14 14:52:04 Android sandbox: enabled 2023/05/14 14:52:04 fault injection: enabled 2023/05/14 14:52:04 leak checking: CONFIG_DEBUG_KMEMLEAK is not enabled 2023/05/14 14:52:04 net packet injection: enabled 2023/05/14 14:52:04 net device setup: enabled 2023/05/14 14:52:04 concurrency sanitizer: enabled 2023/05/14 14:52:04 devlink PCI setup: PCI device 0000:00:10.0 is not available 2023/05/14 14:52:04 NIC VF setup: PCI device 0000:00:11.0 is not available 2023/05/14 14:52:04 USB emulation: /dev/raw-gadget does not exist 2023/05/14 14:52:04 hci packet injection: /dev/vhci does not exist 2023/05/14 14:52:04 wifi device emulation: /sys/class/mac80211_hwsim/ does not exist 2023/05/14 14:52:04 802.15.4 emulation: enabled 2023/05/14 14:52:04 suppressing KCSAN reports in functions: 'generic_fillattr' 'can_receive' 'do_sys_poll' 'jbd2_journal_dirty_metadata' 'xas_clear_mark' '__mark_inode_dirty' 'tick_sched_timer' 'detach_buf_split' '__ip_make_skb' 'ext4_free_inodes_count' 'ext4_do_writepages' '__xa_clear_mark' 'blk_mq_sched_dispatch_requests' 'dont_mount' 'd_delete' 'shmem_get_folio_gfp' 'can_send' '__cgroup_account_cputime' 'generic_write_end' 2023/05/14 14:52:04 fetching corpus: 0, signal 0/2000 (executing program) [ 24.997018][ T25] audit: type=1400 audit(1684075924.046:86): avc: denied { create } for pid=3042 comm="syz-executor" scontext=root:sysadm_r:sysadm_t tcontext=root:sysadm_r:sysadm_t tclass=netlink_generic_socket permissive=1 [ 25.017505][ T25] audit: type=1400 audit(1684075924.046:87): avc: denied { write } for pid=3042 comm="syz-executor" scontext=root:sysadm_r:sysadm_t tcontext=root:sysadm_r:sysadm_t tclass=netlink_generic_socket permissive=1 [ 25.038863][ T25] audit: type=1400 audit(1684075924.046:88): avc: denied { read } for pid=3042 comm="syz-executor" scontext=root:sysadm_r:sysadm_t tcontext=root:sysadm_r:sysadm_t tclass=netlink_generic_socket permissive=1 [ 25.059780][ T25] audit: type=1400 audit(1684075924.076:89): avc: denied { read } for pid=2727 comm="syslogd" name="log" dev="sda1" ino=1915 scontext=system_u:system_r:syslogd_t tcontext=system_u:object_r:var_t tclass=lnk_file permissive=1 2023/05/14 14:52:04 fetching corpus: 50, signal 17603/21401 (executing program) 2023/05/14 14:52:04 fetching corpus: 100, signal 23670/29267 (executing program) 2023/05/14 14:52:04 fetching corpus: 150, signal 28574/35946 (executing program) 2023/05/14 14:52:04 fetching corpus: 200, signal 37567/46520 (executing program) 2023/05/14 14:52:04 fetching corpus: 250, signal 43120/53681 (executing program) 2023/05/14 14:52:04 fetching corpus: 300, signal 47372/59503 (executing program) 2023/05/14 14:52:04 fetching corpus: 350, signal 51248/64886 (executing program) 2023/05/14 14:52:05 fetching corpus: 400, signal 54931/70105 (executing program) 2023/05/14 14:52:05 fetching corpus: 450, signal 57810/74509 (executing program) 2023/05/14 14:52:05 fetching corpus: 500, signal 61548/79707 (executing program) 2023/05/14 14:52:05 fetching corpus: 550, signal 64234/83900 (executing program) 2023/05/14 14:52:05 fetching corpus: 600, signal 66670/87824 (executing program) 2023/05/14 14:52:05 fetching corpus: 650, signal 68547/91161 (executing program) 2023/05/14 14:52:05 fetching corpus: 700, signal 70337/94463 (executing program) 2023/05/14 14:52:05 fetching corpus: 750, signal 72719/98225 (executing program) 2023/05/14 14:52:05 fetching corpus: 800, signal 74072/101010 (executing program) 2023/05/14 14:52:06 fetching corpus: 850, signal 76987/105250 (executing program) 2023/05/14 14:52:06 fetching corpus: 900, signal 78574/108242 (executing program) 2023/05/14 14:52:06 fetching corpus: 950, signal 80684/111700 (executing program) 2023/05/14 14:52:06 fetching corpus: 1000, signal 82426/114781 (executing program) 2023/05/14 14:52:06 fetching corpus: 1050, signal 84237/117900 (executing program) 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(executing program) 2023/05/14 14:52:10 fetching corpus: 2900, signal 128273/203882 (executing program) 2023/05/14 14:52:10 fetching corpus: 2950, signal 129108/205698 (executing program) 2023/05/14 14:52:10 fetching corpus: 3000, signal 130319/207777 (executing program) 2023/05/14 14:52:10 fetching corpus: 3050, signal 130947/209476 (executing program) 2023/05/14 14:52:10 fetching corpus: 3100, signal 131441/211080 (executing program) 2023/05/14 14:52:10 fetching corpus: 3150, signal 132650/213110 (executing program) 2023/05/14 14:52:10 fetching corpus: 3200, signal 133547/214923 (executing program) 2023/05/14 14:52:11 fetching corpus: 3250, signal 134562/216837 (executing program) 2023/05/14 14:52:11 fetching corpus: 3300, signal 135636/218817 (executing program) 2023/05/14 14:52:11 fetching corpus: 3350, signal 136502/220578 (executing program) 2023/05/14 14:52:11 fetching corpus: 3400, signal 137510/222458 (executing program) [ 32.507311][ T0] ================================================================== [ 32.515451][ T0] BUG: KCSAN: data-race in tick_nohz_idle_stop_tick / tick_nohz_idle_stop_tick [ 32.525117][ T0] [ 32.527437][ T0] write to 0xffffffff85f06bb0 of 4 bytes by task 0 on cpu 0: [ 32.534801][ T0] tick_nohz_idle_stop_tick+0x1d9/0x6c0 [ 32.540356][ T0] do_idle+0x177/0x230 [ 32.544417][ T0] cpu_startup_entry+0x18/0x20 [ 32.549178][ T0] rest_init+0xf3/0x100 [ 32.553330][ T0] arch_call_rest_init+0x9/0x10 [ 32.558181][ T0] start_kernel+0x582/0x5e0 [ 32.562689][ T0] x86_64_start_reservations+0x2a/0x30 [ 32.568145][ T0] x86_64_start_kernel+0x94/0xa0 [ 32.573086][ T0] secondary_startup_64_no_verify+0xf5/0xfb [ 32.578979][ T0] [ 32.581291][ T0] read to 0xffffffff85f06bb0 of 4 bytes by task 0 on cpu 1: [ 32.588563][ T0] tick_nohz_idle_stop_tick+0x1b1/0x6c0 [ 32.594117][ T0] do_idle+0x177/0x230 [ 32.598176][ T0] cpu_startup_entry+0x18/0x20 [ 32.602938][ T0] start_secondary+0x7c/0x80 2023/05/14 14:52:11 fetching corpus: 3450, signal 138352/224214 (executing program) [ 32.607535][ T0] secondary_startup_64_no_verify+0xf5/0xfb [ 32.613427][ T0] [ 32.615744][ T0] value changed: 0x00000000 -> 0xffffffff [ 32.621449][ T0] [ 32.623759][ T0] Reported by Kernel Concurrency Sanitizer on: [ 32.629909][ T0] CPU: 1 PID: 0 Comm: swapper/1 Not tainted 6.4.0-rc1-syzkaller-00177-gbb7c241fae62 #0 [ 32.639530][ T0] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 04/28/2023 [ 32.649584][ T0] ================================================================== 2023/05/14 14:52:11 fetching corpus: 3500, signal 139347/226026 (executing program) 2023/05/14 14:52:11 fetching corpus: 3550, signal 140038/227581 (executing program) 2023/05/14 14:52:12 fetching corpus: 3600, signal 140702/229249 (executing program) 2023/05/14 14:52:12 fetching corpus: 3650, signal 141604/230960 (executing program) 2023/05/14 14:52:12 fetching corpus: 3700, signal 142304/232562 (executing program) 2023/05/14 14:52:12 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