On Wed, Jan 2, 2019 at 2:01 PM syzbot <syzbot+2ab493acb9d8329345a3@xxxxxxxxxxxxxxxxxxxxxxxxx> wrote: > > Hello, > > syzbot found the following crash on: > > HEAD commit: 28e8c4bc8eb4 Merge tag 'rtc-4.21' of git://git.kernel.org/.. > git tree: upstream > console output: https://syzkaller.appspot.com/x/log.txt?x=122355bf400000 > kernel config: https://syzkaller.appspot.com/x/.config?x=c2ab9708c613a224 > dashboard link: https://syzkaller.appspot.com/bug?extid=2ab493acb9d8329345a3 > compiler: gcc (GCC) 9.0.0 20181231 (experimental) > syz repro: https://syzkaller.appspot.com/x/repro.syz?x=106e29e7400000 > > IMPORTANT: if you fix the bug, please add the following tag to the commit: > Reported-by: syzbot+2ab493acb9d8329345a3@xxxxxxxxxxxxxxxxxxxxxxxxx A random manifestation of the stack overflow/corruption: #syz dup: kernel panic: stack is corrupted in udp4_lib_lookup2 See https://groups.google.com/forum/#!msg/syzkaller-bugs/vr87kmG5qRI/31nOcuVsFgAJ > ------------[ cut here ]------------ > ================================================================== > DEBUG_LOCKS_WARN_ON(current->hardirq_context) > ------------[ cut here ]------------ > BUG: KASAN: stack-out-of-bounds in debug_spin_lock_before > kernel/locking/spinlock_debug.c:83 [inline] > BUG: KASAN: stack-out-of-bounds in do_raw_spin_lock+0x303/0x360 > kernel/locking/spinlock_debug.c:112 > Bad or missing usercopy whitelist? Kernel memory overwrite attempt detected > to SLAB object 'task_struct' (offset 912, size 2)! > Read of size 4 at addr ffff8880a9466a44 by task kworker/1:0/7562 > WARNING: CPU: 0 PID: -1455013312 at mm/usercopy.c:78 > usercopy_warn+0xeb/0x110 mm/usercopy.c:78 > > Kernel panic - not syncing: panic_on_warn set ... > CPU: 1 PID: 7562 Comm: kworker/1:0 Not tainted 4.20.0+ #4 > Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS > Google 01/01/2011 > Workqueue: rcu_gp process_srcu > Call Trace: > <IRQ> > __dump_stack lib/dump_stack.c:77 [inline] > dump_stack+0x1db/0x2d0 lib/dump_stack.c:113 > print_address_description.cold+0x7c/0x20d mm/kasan/report.c:187 > kasan_report.cold+0x1b/0x40 mm/kasan/report.c:317 > __asan_report_load4_noabort+0x14/0x20 mm/kasan/generic_report.c:134 > debug_spin_lock_before kernel/locking/spinlock_debug.c:83 [inline] > do_raw_spin_lock+0x303/0x360 kernel/locking/spinlock_debug.c:112 > __raw_spin_lock_irqsave include/linux/spinlock_api_smp.h:117 [inline] > _raw_spin_lock_irqsave+0x9d/0xcd kernel/locking/spinlock.c:152 > try_to_wake_up+0xb9/0x1480 kernel/sched/core.c:1965 > wake_up_process+0x10/0x20 kernel/sched/core.c:2129 > process_timeout+0x31/0x40 kernel/time/timer.c:1732 > call_timer_fn+0x254/0x900 kernel/time/timer.c:1325 > expire_timers kernel/time/timer.c:1362 [inline] > __run_timers+0x6fc/0xd50 kernel/time/timer.c:1681 > run_timer_softirq+0x52/0xb0 kernel/time/timer.c:1694 > __do_softirq+0x30b/0xb11 kernel/softirq.c:292 > invoke_softirq kernel/softirq.c:373 [inline] > irq_exit+0x180/0x1d0 kernel/softirq.c:413 > exiting_irq arch/x86/include/asm/apic.h:536 [inline] > smp_apic_timer_interrupt+0x1b7/0x760 arch/x86/kernel/apic/apic.c:1062 > apic_timer_interrupt+0xf/0x20 arch/x86/entry/entry_64.S:807 > </IRQ> > RIP: 0010:rdtsc arch/x86/include/asm/msr.h:207 [inline] > RIP: 0010:rdtsc_ordered arch/x86/include/asm/msr.h:232 [inline] > RIP: 0010:delay_tsc+0x4c/0xc0 arch/x86/lib/delay.c:61 > Code: e8 0f 31 48 c1 e2 20 48 09 c2 49 89 d4 eb 16 f3 90 bf 01 00 00 00 e8 > 33 70 68 f9 e8 de 5c a0 fb 44 39 e8 75 36 0f ae e8 0f 31 <48> c1 e2 20 48 > 89 d3 48 09 c3 48 89 d8 4c 29 e0 4c 39 f0 73 24 bf > RSP: 0018:ffff8880891af5a0 EFLAGS: 00000246 ORIG_RAX: ffffffffffffff13 > RAX: 00000000f513364d RBX: 00000201f5133563 RCX: ffffffff838fb3ca > RDX: 0000000000000201 RSI: ffffffff838fb3d8 RDI: 0000000000000005 > RBP: ffff8880891af5c0 R08: ffff88808f0ec240 R09: fffffbfff16af64d > R10: ffff8880891af710 R11: ffffffff8b57b267 R12: 00000201f51326c9 > R13: 0000000000000001 R14: 0000000000002ced R15: ffffffff8b57aec0 > __delay arch/x86/lib/delay.c:161 [inline] > __const_udelay+0x5f/0x80 arch/x86/lib/delay.c:175 > try_check_zero+0x352/0x5c0 kernel/rcu/srcutree.c:730 > srcu_advance_state kernel/rcu/srcutree.c:1167 [inline] > process_srcu+0x642/0x1400 kernel/rcu/srcutree.c:1261 > process_one_work+0xd0c/0x1ce0 kernel/workqueue.c:2153 > worker_thread+0x143/0x14a0 kernel/workqueue.c:2296 > kthread+0x357/0x430 kernel/kthread.c:246 > ret_from_fork+0x3a/0x50 arch/x86/entry/entry_64.S:352 > > CPU: 0 PID: -1455013312 Comm: Not tainted 4.20.0+ #4 > Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS > Google 01/01/2011 > Allocated by task 2839968544: > Call Trace: > BUG: unable to handle kernel paging request at ffffffff8cf07580 > #PF error: [normal kernel read fault] > PGD 9871067 P4D 9871067 PUD 9872063 PMD 0 > Oops: 0000 [#1] PREEMPT SMP KASAN > CPU: 1 PID: 7562 Comm: kworker/1:0 Not tainted 4.20.0+ #4 > Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS > Google 01/01/2011 > Workqueue: rcu_gp process_srcu > RIP: 0010:depot_fetch_stack+0x10/0x30 lib/stackdepot.c:202 > Code: 36 0f 23 fe e9 20 fe ff ff 48 89 df e8 29 0f 23 fe e9 f1 fd ff ff 90 > 90 90 90 89 f8 c1 ef 11 25 ff ff 1f 00 81 e7 f0 3f 00 00 <48> 03 3c c5 80 > 31 f4 8b 8b 47 0c 48 83 c7 18 c7 46 10 00 00 00 00 > RSP: 0018:ffff8880ae707640 EFLAGS: 00010006 > RAX: 00000000001f8880 RBX: ffff8880a9467a44 RCX: 0000000000000000 > RDX: 0000000000000000 RSI: ffff8880ae707648 RDI: 0000000000003ff0 > RBP: ffff8880ae707670 R08: 000000000000001d R09: ffffed1015ce3ef9 > R10: ffffed1015ce3ef8 R11: ffff8880ae71f7c7 R12: ffffea0002a51980 > R13: ffff8880a9466a44 R14: ffff8880aa13d900 R15: ffff8880a9467a40 > FS: 0000000000000000(0000) GS:ffff8880ae700000(0000) knlGS:0000000000000000 > CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 > CR2: ffffffff8cf07580 CR3: 0000000099fe2000 CR4: 00000000001406e0 > DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 > DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 > Call Trace: > <IRQ> > describe_object mm/kasan/report.c:158 [inline] > print_address_description.cold+0x16a/0x20d mm/kasan/report.c:194 > kasan_report.cold+0x1b/0x40 mm/kasan/report.c:317 > __asan_report_load4_noabort+0x14/0x20 mm/kasan/generic_report.c:134 > debug_spin_lock_before kernel/locking/spinlock_debug.c:83 [inline] > do_raw_spin_lock+0x303/0x360 kernel/locking/spinlock_debug.c:112 > __raw_spin_lock_irqsave include/linux/spinlock_api_smp.h:117 [inline] > _raw_spin_lock_irqsave+0x9d/0xcd kernel/locking/spinlock.c:152 > try_to_wake_up+0xb9/0x1480 kernel/sched/core.c:1965 > wake_up_process+0x10/0x20 kernel/sched/core.c:2129 > process_timeout+0x31/0x40 kernel/time/timer.c:1732 > call_timer_fn+0x254/0x900 kernel/time/timer.c:1325 > expire_timers kernel/time/timer.c:1362 [inline] > __run_timers+0x6fc/0xd50 kernel/time/timer.c:1681 > run_timer_softirq+0x52/0xb0 kernel/time/timer.c:1694 > __do_softirq+0x30b/0xb11 kernel/softirq.c:292 > invoke_softirq kernel/softirq.c:373 [inline] > irq_exit+0x180/0x1d0 kernel/softirq.c:413 > exiting_irq arch/x86/include/asm/apic.h:536 [inline] > smp_apic_timer_interrupt+0x1b7/0x760 arch/x86/kernel/apic/apic.c:1062 > apic_timer_interrupt+0xf/0x20 arch/x86/entry/entry_64.S:807 > </IRQ> > RIP: 0010:rdtsc arch/x86/include/asm/msr.h:207 [inline] > RIP: 0010:rdtsc_ordered arch/x86/include/asm/msr.h:232 [inline] > RIP: 0010:delay_tsc+0x4c/0xc0 arch/x86/lib/delay.c:61 > Code: e8 0f 31 48 c1 e2 20 48 09 c2 49 89 d4 eb 16 f3 90 bf 01 00 00 00 e8 > 33 70 68 f9 e8 de 5c a0 fb 44 39 e8 75 36 0f ae e8 0f 31 <48> c1 e2 20 48 > 89 d3 48 09 c3 48 89 d8 4c 29 e0 4c 39 f0 73 24 bf > RSP: 0018:ffff8880891af5a0 EFLAGS: 00000246 ORIG_RAX: ffffffffffffff13 > RAX: 00000000f513364d RBX: 00000201f5133563 RCX: ffffffff838fb3ca > RDX: 0000000000000201 RSI: ffffffff838fb3d8 RDI: 0000000000000005 > RBP: ffff8880891af5c0 R08: ffff88808f0ec240 R09: fffffbfff16af64d > R10: ffff8880891af710 R11: ffffffff8b57b267 R12: 00000201f51326c9 > R13: 0000000000000001 R14: 0000000000002ced R15: ffffffff8b57aec0 > __delay arch/x86/lib/delay.c:161 [inline] > __const_udelay+0x5f/0x80 arch/x86/lib/delay.c:175 > try_check_zero+0x352/0x5c0 kernel/rcu/srcutree.c:730 > srcu_advance_state kernel/rcu/srcutree.c:1167 [inline] > process_srcu+0x642/0x1400 kernel/rcu/srcutree.c:1261 > process_one_work+0xd0c/0x1ce0 kernel/workqueue.c:2153 > worker_thread+0x143/0x14a0 kernel/workqueue.c:2296 > kthread+0x357/0x430 kernel/kthread.c:246 > ret_from_fork+0x3a/0x50 arch/x86/entry/entry_64.S:352 > Modules linked in: > CR2: ffffffff8cf07580 > ---[ end trace 7f399f30ebf94723 ]--- > RIP: 0010:depot_fetch_stack+0x10/0x30 lib/stackdepot.c:202 > Code: 36 0f 23 fe e9 20 fe ff ff 48 89 df e8 29 0f 23 fe e9 f1 fd ff ff 90 > 90 90 90 89 f8 c1 ef 11 25 ff ff 1f 00 81 e7 f0 3f 00 00 <48> 03 3c c5 80 > 31 f4 8b 8b 47 0c 48 83 c7 18 c7 46 10 00 00 00 00 > RSP: 0018:ffff8880ae707640 EFLAGS: 00010006 > RAX: 00000000001f8880 RBX: ffff8880a9467a44 RCX: 0000000000000000 > RDX: 0000000000000000 RSI: ffff8880ae707648 RDI: 0000000000003ff0 > RBP: ffff8880ae707670 R08: 000000000000001d R09: ffffed1015ce3ef9 > R10: ffffed1015ce3ef8 R11: ffff8880ae71f7c7 R12: ffffea0002a51980 > R13: ffff8880a9466a44 R14: ffff8880aa13d900 R15: ffff8880a9467a40 > FS: 0000000000000000(0000) GS:ffff8880ae700000(0000) knlGS:0000000000000000 > CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 > CR2: ffffffff8cf07580 CR3: 0000000099fe2000 CR4: 00000000001406e0 > DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 > DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 > Shutting down cpus with NMI > usercopy: Kernel memory overwrite attempt detected to SLAB > object 'sighand_cache' (offset 2320, size 2)! > ------------[ cut here ]------------ > kernel BUG at mm/usercopy.c:102! > WARNING: CPU: 0 PID: -1455013312 at kernel/rcu/tree_plugin.h:414 > __rcu_read_lock+0x75/0x90 kernel/rcu/tree_plugin.h:416 > Modules linked in: > CPU: 0 PID: -1455013312 Comm: Tainted: G D 4.20.0+ #4 > Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS > Google 01/01/2011 > RIP: 0010:__rcu_read_lock+0x75/0x90 kernel/rcu/tree_plugin.h:414 > Code: 00 48 8d bb 70 03 00 00 48 89 fa 48 c1 ea 03 0f b6 04 02 84 c0 74 04 > 3c 03 7e 14 81 bb 70 03 00 00 ff ff ff 3f 7f 03 5b 5d c3 <0f> 0b 5b 5d c3 > e8 61 db 59 00 eb e5 e8 5a db 59 00 eb aa 0f 1f 84 > RSP: 0018:ffff8880a9463850 EFLAGS: 00010012 > RAX: 0000000000000000 RBX: ffff8880a9464240 RCX: ffffffff816b545f > RDX: 0000000000000000 RSI: 0000000000000004 RDI: ffff8880a94645b0 > RBP: ffff8880a9463858 R08: ffff8880a9464240 R09: 0000000000000004 > R10: ffffed1015cc3ef8 R11: ffff8880ae61f7c7 R12: 0000000000000000 > R13: 0000000000000008 R14: ffff8880a94638d0 R15: ffff8880a94639d8 > FS: 0000000000000000(0000) GS:ffff8880ae600000(0000) knlGS:0000000000000000 > CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 > CR2: 00007f1524df3169 CR3: 000000008509b000 CR4: 00000000001406f0 > DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 > DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 > Call Trace: > irq event stamp: 2321324489 > hardirqs last enabled at (2170814927): [<ffffed101528c974>] > 0xffffed101528c974 > hardirqs last disabled at (2321324489): [<ffffffff8167a729>] > vprintk_emit+0x169/0x960 kernel/printk/printk.c:1911 > softirqs last enabled at (0): [<ffffffff86e92120>] gue6_err+0x0/0x6b0 > net/ipv6/fou6.c:86 > softirqs last disabled at (1): [<0000000000000001>] 0x1 > ---[ end trace 7f399f30ebf94724 ]--- > invalid opcode: 0000 [#2] PREEMPT SMP KASAN > CPU: 0 PID: -1455013312 Comm: Tainted: G D W 4.20.0+ #4 > Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS > Google 01/01/2011 > RIP: 0010:usercopy_abort+0xbd/0xbf mm/usercopy.c:102 > Code: c0 e8 0d 0b b2 ff 48 8b 55 c0 49 89 d9 4d 89 f0 ff 75 c8 4c 89 e1 4c > 89 ee 48 c7 c7 00 27 55 88 ff 75 d0 41 57 e8 5d 4b 98 ff <0f> 0b e8 e2 0a > b2 ff e8 dd af f5 ff 8b 95 20 ff ff ff 4c 89 e1 31 > RSP: 0018:ffff8880a9463a80 EFLAGS: 00010086 > RAX: 0000000000000068 RBX: ffffffff88494720 RCX: 0000000000000000 > RDX: 0000000000000000 RSI: ffffffff8167d666 RDI: ffffed101528c742 > RBP: ffff8880a9463ad8 R08: 0000000000000068 R09: ffffed1015cc3ef9 > R10: ffffed1015cc3ef8 R11: ffff8880ae61f7c7 R12: ffffffff893bcfb5 > R13: ffffffff88552560 R14: ffffffff885524a0 R15: ffffffff88552460 > FS: 0000000000000000(0000) GS:ffff8880ae600000(0000) knlGS:0000000000000000 > CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 > CR2: 00007f1524df3169 CR3: 000000008509b000 CR4: 00000000001406f0 > DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 > DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 > Call Trace: > Modules linked in: > ---[ end trace 7f399f30ebf94725 ]--- > RIP: 0010:depot_fetch_stack+0x10/0x30 lib/stackdepot.c:202 > Code: 36 0f 23 fe e9 20 fe ff ff 48 89 df e8 29 0f 23 fe e9 f1 fd ff ff 90 > 90 90 90 89 f8 c1 ef 11 25 ff ff 1f 00 81 e7 f0 3f 00 00 <48> 03 3c c5 80 > 31 f4 8b 8b 47 0c 48 83 c7 18 c7 46 10 00 00 00 00 > RSP: 0018:ffff8880ae707640 EFLAGS: 00010006 > RAX: 00000000001f8880 RBX: ffff8880a9467a44 RCX: 0000000000000000 > RDX: 0000000000000000 RSI: ffff8880ae707648 RDI: 0000000000003ff0 > RBP: ffff8880ae707670 R08: 000000000000001d R09: ffffed1015ce3ef9 > R10: ffffed1015ce3ef8 R11: ffff8880ae71f7c7 R12: ffffea0002a51980 > R13: ffff8880a9466a44 R14: ffff8880aa13d900 R15: ffff8880a9467a40 > FS: 0000000000000000(0000) GS:ffff8880ae600000(0000) knlGS:0000000000000000 > CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 > CR2: 00007f1524df3169 CR3: 000000008509b000 CR4: 00000000001406f0 > DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 > DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 > > > --- > This bug 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 bug report. See: > https://goo.gl/tpsmEJ#bug-status-tracking for how to communicate with > syzbot. > syzbot can test patches for this bug, for details see: > https://goo.gl/tpsmEJ#testing-patches > > -- > You received this message because you are subscribed to the Google Groups "syzkaller-bugs" group. > To unsubscribe from this group and stop receiving emails from it, send an email to syzkaller-bugs+unsubscribe@xxxxxxxxxxxxxxxx. > To view this discussion on the web visit https://groups.google.com/d/msgid/syzkaller-bugs/000000000000133d0a057e793df4%40google.com. > For more options, visit https://groups.google.com/d/optout.
