Hello, syzbot found the following issue on: HEAD commit: a74e6a01 Merge tag 's390-5.12-3' of git://git.kernel.org/p.. git tree: upstream console output: https://syzkaller.appspot.com/x/log.txt?x=16f7c83ad00000 kernel config: https://syzkaller.appspot.com/x/.config?x=c7ac5ce2d1160e16 dashboard link: https://syzkaller.appspot.com/bug?extid=e79c128f58297b9148dc userspace arch: arm Unfortunately, I don't have any reproducer for this issue yet. IMPORTANT: if you fix the issue, please add the following tag to the commit: Reported-by: syzbot+e79c128f58297b9148dc@xxxxxxxxxxxxxxxxxxxxxxxxx ------------[ cut here ]------------ WARNING: CPU: 0 PID: 7650 at include/linux/seqlock.h:271 __seqprop_assert include/linux/seqlock.h:271 [inline] WARNING: CPU: 0 PID: 7650 at include/linux/seqlock.h:271 __seqprop_assert.constprop.0+0xf0/0x11c include/linux/seqlock.h:269 Modules linked in: Kernel panic - not syncing: panic_on_warn set ... CPU: 0 PID: 7650 Comm: udevd Not tainted 5.12.0-rc2-syzkaller #0 Hardware name: ARM-Versatile Express Backtrace: [<82107738>] (dump_backtrace) from [<821079ac>] (show_stack+0x18/0x1c arch/arm/kernel/traps.c:252) r7:00000080 r6:60000093 r5:00000000 r4:83966184 [<82107994>] (show_stack) from [<82110980>] (__dump_stack lib/dump_stack.c:79 [inline]) [<82107994>] (show_stack) from [<82110980>] (dump_stack+0xb8/0xe8 lib/dump_stack.c:120) [<821108c8>] (dump_stack) from [<82108540>] (panic+0x130/0x378 kernel/panic.c:231) r7:8293262c r6:8383dd64 r5:00000000 r4:83b620d0 [<82108410>] (panic) from [<80244924>] (__warn+0xb0/0x164 kernel/panic.c:605) r3:83822c8c r2:00000000 r1:00000000 r0:8293262c r7:0000010f [<80244874>] (__warn) from [<821087f0>] (warn_slowpath_fmt+0x68/0xd4 kernel/panic.c:628) r7:818c4fc8 r6:0000010f r5:8292aac0 r4:00000000 [<8210878c>] (warn_slowpath_fmt) from [<818c4fc8>] (__seqprop_assert include/linux/seqlock.h:271 [inline]) [<8210878c>] (warn_slowpath_fmt) from [<818c4fc8>] (__seqprop_assert.constprop.0+0xf0/0x11c include/linux/seqlock.h:269) r8:e85fc000 r7:819ab52c r6:00000001 r5:88799e40 r4:00000001 [<818c4ed8>] (__seqprop_assert.constprop.0) from [<818c7524>] (u64_stats_update_begin include/linux/u64_stats_sync.h:128 [inline]) [<818c4ed8>] (__seqprop_assert.constprop.0) from [<818c7524>] (__bpf_prog_run_save_cb include/linux/filter.h:727 [inline]) [<818c4ed8>] (__seqprop_assert.constprop.0) from [<818c7524>] (bpf_prog_run_save_cb include/linux/filter.h:741 [inline]) [<818c4ed8>] (__seqprop_assert.constprop.0) from [<818c7524>] (sk_filter_trim_cap+0x224/0x434 net/core/filter.c:149) r5:88799e40 r4:00000000 [<818c7300>] (sk_filter_trim_cap) from [<819ab52c>] (sk_filter include/linux/filter.h:867 [inline]) [<818c7300>] (sk_filter_trim_cap) from [<819ab52c>] (do_one_broadcast net/netlink/af_netlink.c:1468 [inline]) [<818c7300>] (sk_filter_trim_cap) from [<819ab52c>] (netlink_broadcast_filtered+0x27c/0x4fc net/netlink/af_netlink.c:1520) r10:00000001 r9:8430585c r8:00000000 r7:86f24064 r6:88799e40 r5:88f45000 r4:86f24000 [<819ab2b0>] (netlink_broadcast_filtered) from [<819ae010>] (netlink_broadcast net/netlink/af_netlink.c:1544 [inline]) [<819ab2b0>] (netlink_broadcast_filtered) from [<819ae010>] (netlink_sendmsg+0x3d0/0x478 net/netlink/af_netlink.c:1925) r10:00000000 r9:00000002 r8:88f45000 r7:000000ce r6:88799780 r5:88b8ff50 r4:88e82800 [<819adc40>] (netlink_sendmsg) from [<81867400>] (sock_sendmsg_nosec net/socket.c:654 [inline]) [<819adc40>] (netlink_sendmsg) from [<81867400>] (sock_sendmsg+0x3c/0x4c net/socket.c:674) r10:00000000 r9:88b8fdd4 r8:00000000 r7:87dc4680 r6:00000000 r5:87dc4680 r4:88b8ff50 [<818673c4>] (sock_sendmsg) from [<8186897c>] (____sys_sendmsg+0x230/0x29c net/socket.c:2350) r5:00000040 r4:88b8ff50 [<8186874c>] (____sys_sendmsg) from [<8186a968>] (___sys_sendmsg+0xac/0xe4 net/socket.c:2404) r10:00000128 r9:88b8e000 r8:00000000 r7:00000000 r6:87dc4680 r5:88b8ff50 r4:00000000 [<8186a8bc>] (___sys_sendmsg) from [<8186ab50>] (__sys_sendmsg net/socket.c:2433 [inline]) [<8186a8bc>] (___sys_sendmsg) from [<8186ab50>] (__do_sys_sendmsg net/socket.c:2442 [inline]) [<8186a8bc>] (___sys_sendmsg) from [<8186ab50>] (sys_sendmsg+0x58/0xa0 net/socket.c:2440) r8:80200224 r7:00000128 r6:00000000 r5:7e90c3dc r4:87dc4680 [<8186aaf8>] (sys_sendmsg) from [<80200060>] (ret_fast_syscall+0x0/0x2c arch/arm/mm/proc-v7.S:64) Exception stack(0x88b8ffa8 to 0x88b8fff0) ffa0: 00000000 00000000 0000000c 7e90c3dc 00000000 00000000 ffc0: 00000000 00000000 76f1f840 00000128 00000000 000000a6 7e90c3dc 000563f8 ffe0: 00056110 7e90c3a0 00036cec 76bfbf44 r6:76f1f840 r5:00000000 r4:00000000 Dumping ftrace buffer: (ftrace buffer empty) Rebooting in 1 seconds.. --- This report is generated by a bot. It may contain errors. See https://goo.gl/tpsmEJ for more information about syzbot. syzbot engineers can be reached at syzkaller@xxxxxxxxxxxxxxxx. syzbot will keep track of this issue. See: https://goo.gl/tpsmEJ#status for how to communicate with syzbot.
