Messages in this thread | | | Date | Mon, 07 Jun 2021 08:46:26 -0700 | Subject | [syzbot] BUG: sleeping function called from invalid context in console_lock (2) | From | syzbot <> |
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Hello,
syzbot found the following issue on:
HEAD commit: e5220dd1 Merge branch 'akpm' (patches from Andrew) git tree: upstream console output: https://syzkaller.appspot.com/x/log.txt?x=13fbe875d00000 kernel config: https://syzkaller.appspot.com/x/.config?x=8a9e9956ca52a5f6 dashboard link: https://syzkaller.appspot.com/bug?extid=dbac96d8e73b61aa559c syz repro: https://syzkaller.appspot.com/x/repro.syz?x=14ae4ec0300000 C reproducer: https://syzkaller.appspot.com/x/repro.c?x=12f3c6c0300000
Bisection is inconclusive: the issue happens on the oldest tested release.
bisection log: https://syzkaller.appspot.com/x/bisect.txt?x=13e0c2e0300000 final oops: https://syzkaller.appspot.com/x/report.txt?x=1010c2e0300000 console output: https://syzkaller.appspot.com/x/log.txt?x=17e0c2e0300000
IMPORTANT: if you fix the issue, please add the following tag to the commit: Reported-by: syzbot+dbac96d8e73b61aa559c@syzkaller.appspotmail.com
BUG: sleeping function called from invalid context at kernel/printk/printk.c:2460 in_atomic(): 1, irqs_disabled(): 1, non_block: 0, pid: 8430, name: syz-executor396 3 locks held by syz-executor396/8430: #0: ffff88801f8ff098 (&tty->ldisc_sem){++++}-{0:0}, at: tty_ldisc_ref_wait+0x22/0x80 drivers/tty/tty_ldisc.c:267 #1: ffff88801f8ff3f8 (&tty->flow_lock){....}-{2:2}, at: spin_lock_irq include/linux/spinlock.h:379 [inline] #1: ffff88801f8ff3f8 (&tty->flow_lock){....}-{2:2}, at: n_tty_ioctl_helper+0xcc/0x3a0 drivers/tty/tty_ioctl.c:857 #2: ffff88801f8ff098 (&tty->ldisc_sem){++++}-{0:0}, at: tty_ldisc_ref+0x1d/0x80 drivers/tty/tty_ldisc.c:288 irq event stamp: 16848 hardirqs last enabled at (16847): [<ffffffff89193940>] __raw_spin_unlock_irqrestore include/linux/spinlock_api_smp.h:160 [inline] hardirqs last enabled at (16847): [<ffffffff89193940>] _raw_spin_unlock_irqrestore+0x50/0x70 kernel/locking/spinlock.c:191 hardirqs last disabled at (16848): [<ffffffff891936a1>] __raw_spin_lock_irq include/linux/spinlock_api_smp.h:126 [inline] hardirqs last disabled at (16848): [<ffffffff891936a1>] _raw_spin_lock_irq+0x41/0x50 kernel/locking/spinlock.c:167 softirqs last enabled at (15244): [<ffffffff812aa603>] fpu__clear+0xd3/0x220 arch/x86/kernel/fpu/core.c:379 softirqs last disabled at (15242): [<ffffffff812aa55a>] fpu__clear+0x2a/0x220 arch/x86/kernel/fpu/core.c:364 Preemption disabled at: [<0000000000000000>] 0x0 CPU: 1 PID: 8430 Comm: syz-executor396 Not tainted 5.13.0-rc4-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Call Trace: __dump_stack lib/dump_stack.c:79 [inline] dump_stack+0x141/0x1d7 lib/dump_stack.c:120 ___might_sleep.cold+0x1f1/0x237 kernel/sched/core.c:8338 console_lock+0x19/0x80 kernel/printk/printk.c:2460 do_con_write+0x10f/0x1e60 drivers/tty/vt/vt.c:2868 con_write+0x21/0x40 drivers/tty/vt/vt.c:3255 n_hdlc_send_frames+0x24b/0x490 drivers/tty/n_hdlc.c:290 tty_wakeup+0xe1/0x120 drivers/tty/tty_io.c:534 __start_tty drivers/tty/tty_io.c:822 [inline] __start_tty+0x116/0x150 drivers/tty/tty_io.c:815 n_tty_ioctl_helper+0x348/0x3a0 drivers/tty/tty_ioctl.c:860 n_hdlc_tty_ioctl+0xe4/0x360 drivers/tty/n_hdlc.c:631 tty_ioctl+0xef9/0x1600 drivers/tty/tty_io.c:2814 vfs_ioctl fs/ioctl.c:51 [inline] __do_sys_ioctl fs/ioctl.c:1069 [inline] __se_sys_ioctl fs/ioctl.c:1055 [inline] __x64_sys_ioctl+0x193/0x200 fs/ioctl.c:1055 do_syscall_64+0x3a/0xb0 arch/x86/entry/common.c:47 entry_SYSCALL_64_after_hwframe+0x44/0xae RIP: 0033:0x43f159 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:00007ffc20312ca8 EFLAGS: 00000246 ORIG_RAX: 0000000000000010 RAX: ffffffffffffffda RBX: 0000000000400488 RCX: 000000000043f159 RDX: 0000000000000001 RSI: 000000000000540a RDI: 0000000000000003 RBP: 0000000000402fe0 R08: 0000000000400488 R09: 0000000000400488
--- 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@googlegroups.com.
syzbot will keep track of this issue. See: https://goo.gl/tpsmEJ#status for how to communicate with syzbot. For information about bisection process see: https://goo.gl/tpsmEJ#bisection syzbot can test patches for this issue, for details see: https://goo.gl/tpsmEJ#testing-patches
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