Hello, syzbot found the following issue on: HEAD commit: 8755ae45a9e8 Add linux-next specific files for 20220819 git tree: linux-next console+strace: https://syzkaller.appspot.com/x/log.txt?x=14c3b6eb080000 kernel config: https://syzkaller.appspot.com/x/.config?x=ead6107a3bbe3c62 dashboard link: https://syzkaller.appspot.com/bug?extid=5fb61eb0bea5eab81137 compiler: gcc (Debian 10.2.1-6) 10.2.1 20210110, GNU ld (GNU Binutils for Debian) 2.35.2 syz repro: https://syzkaller.appspot.com/x/repro.syz?x=166bdb3d080000 C reproducer: https://syzkaller.appspot.com/x/repro.c?x=16298e5b080000 IMPORTANT: if you fix the issue, please add the following tag to the commit: Reported-by: syzbot+5fb61eb0bea5eab81137@xxxxxxxxxxxxxxxxxxxxxxxxx FAULT_INJECTION: forcing a failure. name fail_usercopy, interval 1, probability 0, space 0, times 1 CPU: 0 PID: 3608 Comm: syz-executor343 Not tainted 6.0.0-rc1-next-20220819-syzkaller #0 BUG: sleeping function called from invalid context at kernel/locking/rwsem.c:1521 in_atomic(): 0, irqs_disabled(): 1, non_block: 0, pid: 3608, name: syz-executor343 preempt_count: 0, expected: 0 RCU nest depth: 0, expected: 0 no locks held by syz-executor343/3608. irq event stamp: 4344 hardirqs last enabled at (4343): [<ffffffff816199ce>] __up_console_sem+0xae/0xc0 kernel/printk/printk.c:264 hardirqs last disabled at (4344): [<ffffffff894c1738>] dump_stack_lvl+0x2e/0x134 lib/dump_stack.c:139 softirqs last enabled at (4338): [<ffffffff81491a33>] invoke_softirq kernel/softirq.c:445 [inline] softirqs last enabled at (4338): [<ffffffff81491a33>] __irq_exit_rcu+0x123/0x180 kernel/softirq.c:650 softirqs last disabled at (4313): [<ffffffff81491a33>] invoke_softirq kernel/softirq.c:445 [inline] softirqs last disabled at (4313): [<ffffffff81491a33>] __irq_exit_rcu+0x123/0x180 kernel/softirq.c:650 CPU: 0 PID: 3608 Comm: syz-executor343 Not tainted 6.0.0-rc1-next-20220819-syzkaller #0 syz-executor343[3608] cmdline: ./syz-executor3436215905 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/22/2022 Call Trace: <TASK> __dump_stack lib/dump_stack.c:122 [inline] dump_stack_lvl+0xcd/0x134 lib/dump_stack.c:140 __might_resched.cold+0x222/0x26b kernel/sched/core.c:9896 down_read_killable+0x75/0x490 kernel/locking/rwsem.c:1521 mmap_read_lock_killable include/linux/mmap_lock.h:126 [inline] __access_remote_vm+0xac/0x6f0 mm/memory.c:5461 get_mm_cmdline.part.0+0x217/0x620 fs/proc/base.c:299 get_mm_cmdline fs/proc/base.c:367 [inline] get_task_cmdline_kernel+0x1d9/0x220 fs/proc/base.c:367 dump_stack_print_cmdline.part.0+0x82/0x150 lib/dump_stack.c:61 dump_stack_print_cmdline lib/dump_stack.c:89 [inline] dump_stack_print_info+0x185/0x190 lib/dump_stack.c:97 __dump_stack lib/dump_stack.c:121 [inline] dump_stack_lvl+0xc1/0x134 lib/dump_stack.c:140 fail_dump lib/fault-inject.c:55 [inline] should_fail.cold+0x5/0xa lib/fault-inject.c:155 copyin+0x19/0x120 lib/iov_iter.c:177 _copy_from_iter+0x36e/0x11c0 lib/iov_iter.c:628 copy_from_iter include/linux/uio.h:184 [inline] copy_from_iter_full include/linux/uio.h:191 [inline] memcpy_from_msg include/linux/skbuff.h:3938 [inline] netlink_sendmsg+0x875/0xe10 net/netlink/af_netlink.c:1906 sock_sendmsg_nosec net/socket.c:714 [inline] sock_sendmsg+0xcf/0x120 net/socket.c:734 ____sys_sendmsg+0x6eb/0x810 net/socket.c:2482 ___sys_sendmsg+0x110/0x1b0 net/socket.c:2536 __sys_sendmsg+0xf3/0x1c0 net/socket.c:2565 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x35/0xb0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x63/0xcd RIP: 0033:0x7f4f5b3848f9 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 RSP: 002b:00007ffdfef8b808 EFLAGS: 00000246 ORIG_RAX: 000000000000002e RAX: ffffffffffffffda RBX: 0000000000000001 RCX: 00007f4f5b3848f9 RDX: 0000000000000000 RSI: 00000000200001c0 RDI: 0000000000000003 RBP: 00007ffdfef8b810 R08: 0000000000000001 R09: 00007f4f5b340035 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000004 R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000 </TASK> syz-executor343[3608] cmdline: ./syz-executor3436215905 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/22/2022 Call Trace: <TASK> __dump_stack lib/dump_stack.c:122 [inline] dump_stack_lvl+0xcd/0x134 lib/dump_stack.c:140 fail_dump lib/fault-inject.c:55 [inline] should_fail.cold+0x5/0xa lib/fault-inject.c:155 copyin+0x19/0x120 lib/iov_iter.c:177 _copy_from_iter+0x36e/0x11c0 lib/iov_iter.c:628 copy_from_iter include/linux/uio.h:184 [inline] copy_from_iter_full include/linux/uio.h:191 [inline] memcpy_from_msg include/linux/skbuff.h:3938 [inline] netlink_sendmsg+0x875/0xe10 net/netlink/af_netlink.c:1906 sock_sendmsg_nosec net/socket.c:714 [inline] sock_sendmsg+0xcf/0x120 net/socket.c:734 ____sys_sendmsg+0x6eb/0x810 net/socket.c:2482 ___sys_sendmsg+0x110/0x1b0 net/socket.c:2536 __sys_sendmsg+0xf3/0x1c0 net/socket.c:2565 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x35/0xb0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x63/0xcd RIP: 0033:0x7f4f5b3848f9 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 RSP: 002b:00007ffdfef8b808 EFLAGS: 00000246 ORIG_RAX: 000000000000002e RAX: ffffffffffffffda RBX: 0000000000000001 RCX: --- 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. syzbot can test patches for this issue, for details see: https://goo.gl/tpsmEJ#testing-patches
