BUG: unable to handle kernel paging request in __syscall_return_slowpath

Status: closed as dup on 2020/08/15 13:40
Subsystems: kernel
[Documentation on labels]
Reported-by: syzbot+8c37a0f3f00cf0dc8cfd@syzkaller.appspotmail.com
First crash: 2192d, last: 2192d
Cause bisection: the issue happens on the oldest tested release (bisect log)
Crash: WARNING in sysfs_warn_dup (log)
Repro: syz .config
  
▶ ▼ Duplicate of
Title Rank 🛈 Repro Cause bisect Fix bisect Count Last Reported
general protection fault in syscall_return_slowpath kernel 2 syz inconclusive done 1 2246d 2332d
▶ ▼ Discussions (1)
Title Replies (including bot) Last reply
BUG: unable to handle kernel paging request in __syscall_return_slowpath 0 (1) 2020/07/31 03:14

Sample crash report:
BUG: unable to handle page fault for address: fffffffffffffffe
#PF: supervisor write access in kernel mode
#PF: error_code(0x0002) - not-present page
PGD 9a7c067 P4D 9a7c067 PUD 9a7e067 PMD 0 
Oops: 0002 [#1] PREEMPT SMP KASAN
CPU: 1 PID: 3892 Comm: systemd-udevd Not tainted 5.8.0-rc6-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
RIP: 0010:__syscall_return_slowpath+0x0/0x280 arch/x86/entry/common.c:332
Code: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 <00> 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
RSP: 0018:ffffc900015b7f38 EFLAGS: 00010283
RAX: fffffffffffffffe RBX: 0000000000000015 RCX: 1ffff920002b6fd5
RDX: ffff88809d834000 RSI: ffffffff81bcb65f RDI: ffffc900015b7f58
RBP: ffffc900015b7f58 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000001 R11: 0000000000000000 R12: 0000000000000000
R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000
FS:  00007f0863b0d8c0(0000) GS:ffff8880ae700000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: fffffffffffffffe CR3: 000000009a278000 CR4: 00000000001406e0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 do_syscall_64+0x6c/0xe0 arch/x86/entry/common.c:393
 entry_SYSCALL_64_after_hwframe+0x44/0xa9
BUG: kernel NULL pointer dereference, address: 0000000000000000
#PF: supervisor write access in kernel mode
#PF: error_code(0x0002) - not-present page
PGD 0 P4D 0 
Oops: 0002 [#2] PREEMPT SMP KASAN
CPU: 1 PID: 3892 Comm: systemd-udevd Not tainted 5.8.0-rc6-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
RIP: 0010:in_gate_area_no_mm+0x0/0x6a arch/x86/entry/vsyscall/vsyscall_64.c:343
Code: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 <00> 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
RSP: 0018:ffffc900015b74a0 EFLAGS: 00010093
RAX: 0000000000000000 RBX: ffffc900015b7540 RCX: ffffffff816a6330
RDX: ffff88809d834000 RSI: ffffffff816a635b RDI: 00007f08629809c7
RBP: 00007f08629809c7 R08: ffffc900015b7650 R09: ffffffff8c8d7109
R10: 00007f08629809c7 R11: 0000000000000000 R12: ffffc900015b7650
R13: 0000000000000001 R14: 00007f08629809c7 R15: ffffc900015b7560
FS:  00007f0863b0d8c0(0000) GS:ffff8880ae700000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000000000000000 CR3: 000000009a278000 CR4: 00000000001406e0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 is_kernel include/linux/kallsyms.h:44 [inline]
 is_ksym_addr include/linux/kallsyms.h:50 [inline]
 kallsyms_lookup+0xc3/0x2e0 kernel/kallsyms.c:290
 __sprint_symbol+0x9c/0x1c0 kernel/kallsyms.c:363
 symbol_string+0x14c/0x370 lib/vsprintf.c:969
 pointer+0x185/0x970 lib/vsprintf.c:2226
 vsnprintf+0x5b2/0x14f0 lib/vsprintf.c:2624
 vscnprintf+0x29/0x80 lib/vsprintf.c:2723
 vprintk_store+0x44/0x4a0 kernel/printk/printk.c:1942
 vprintk_emit+0x139/0x770 kernel/printk/printk.c:2003
 vprintk_func+0x8f/0x1a6 kernel/printk/printk_safe.c:393
 printk+0xba/0xed kernel/printk/printk.c:2070
 show_ip+0x22/0x30 arch/x86/kernel/dumpstack.c:131
 show_iret_regs+0x10/0x32 arch/x86/kernel/dumpstack.c:138
 __show_regs+0x18/0x50 arch/x86/kernel/process_64.c:72
 show_trace_log_lvl+0x255/0x2b4 arch/x86/kernel/dumpstack.c:281
 show_regs arch/x86/kernel/dumpstack.c:454 [inline]
 __die_body arch/x86/kernel/dumpstack.c:400 [inline]
 __die+0x51/0x90 arch/x86/kernel/dumpstack.c:414
 no_context+0x56b/0x9f0 arch/x86/mm/fault.c:695
 __bad_area_nosemaphore+0xa9/0x480 arch/x86/mm/fault.c:789
 do_kern_addr_fault+0x5b/0x6f arch/x86/mm/fault.c:1130
 handle_page_fault arch/x86/mm/fault.c:1363 [inline]
 exc_page_fault+0x14c/0x170 arch/x86/mm/fault.c:1418
 asm_exc_page_fault+0x1e/0x30 arch/x86/include/asm/idtentry.h:542
RIP: 0010:__syscall_return_slowpath+0x0/0x280 arch/x86/entry/common.c:332
Code: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 <00> 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
RSP: 0018:ffffc900015b7f38 EFLAGS: 00010283
RAX: fffffffffffffffe RBX: 0000000000000015 RCX: 1ffff920002b6fd5
RDX: ffff88809d834000 RSI: ffffffff81bcb65f RDI: ffffc900015b7f58
RBP: ffffc900015b7f58 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000001 R11: 0000000000000000 R12: 0000000000000000
R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000
 do_syscall_64+0x6c/0xe0 arch/x86/entry/common.c:393
 entry_SYSCALL_64_after_hwframe+0x44/0xa9
BUG: kernel NULL pointer dereference, address: 0000000000000000
#PF: supervisor write access in kernel mode
#PF: error_code(0x0002) - not-present page
PGD 0 P4D 0 
Oops: 0002 [#3] PREEMPT SMP KASAN
CPU: 1 PID: 3892 Comm: systemd-udevd Not tainted 5.8.0-rc6-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
RIP: 0010:in_gate_area_no_mm+0x0/0x6a arch/x86/entry/vsyscall/vsyscall_64.c:343
Code: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 <00> 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
RSP: 0018:ffffc900015b6990 EFLAGS: 00010093
RAX: 0000000000000000 RBX: ffffc900015b6a30 RCX: ffffffff816a6330
RDX: ffff88809d834000 RSI: ffffffff816a635b RDI: 00007f08629809c7
RBP: 00007f08629809c7 R08: ffffc900015b6b40 R09: ffff8880ae723d62
R10: 00007f08629809c7 R11: 0000000000000001 R12: ffffc900015b6b40
R13: 0000000000000001 R14: 00007f08629809c7 R15: ffffc900015b6a50
FS:  00007f0863b0d8c0(0000) GS:ffff8880ae700000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000000000000000 CR3: 000000009a278000 CR4: 00000000001406e0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 is_kernel include/linux/kallsyms.h:44 [inline]
 is_ksym_addr include/linux/kallsyms.h:50 [inline]
 kallsyms_lookup+0xc3/0x2e0 kernel/kallsyms.c:290
 __sprint_symbol+0x9c/0x1c0 kernel/kallsyms.c:363
 symbol_string+0x14c/0x370 lib/vsprintf.c:969
 pointer+0x185/0x970 lib/vsprintf.c:2226
 vsnprintf+0x5b2/0x14f0 lib/vsprintf.c:2624
 vscnprintf+0x29/0x80 lib/vsprintf.c:2723
 printk_safe_log_store+0xf5/0x250 kernel/printk/printk_safe.c:94
 vprintk_safe kernel/printk/printk_safe.c:347 [inline]
 vprintk_func+0xef/0x1a6 kernel/printk/printk_safe.c:390
 printk+0xba/0xed kernel/printk/printk.c:2070
 show_ip+0x22/0x30 arch/x86/kernel/dumpstack.c:131
 show_iret_regs+0x10/0x32 arch/x86/kernel/dumpstack.c:138
 __show_regs+0x18/0x50 arch/x86/kernel/process_64.c:72
 show_trace_log_lvl+0x255/0x2b4 arch/x86/kernel/dumpstack.c:281
 show_regs arch/x86/kernel/dumpstack.c:454 [inline]
 __die_body arch/x86/kernel/dumpstack.c:400 [inline]
 __die+0x51/0x90 arch/x86/kernel/dumpstack.c:414
 no_context+0x56b/0x9f0 arch/x86/mm/fault.c:695
 __bad_area_nosemaphore+0xa9/0x480 arch/x86/mm/fault.c:789
 do_user_addr_fault+0x783/0xd00 arch/x86/mm/fault.c:1171
 handle_page_fault arch/x86/mm/fault.c:1365 [inline]
 exc_page_fault+0xab/0x170 arch/x86/mm/fault.c:1418
 asm_exc_page_fault+0x1e/0x30 arch/x86/include/asm/idtentry.h:542
RIP: 0010:in_gate_area_no_mm+0x0/0x6a arch/x86/entry/vsyscall/vsyscall_64.c:343
Code: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 <00> 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
RSP: 0018:ffffc900015b74a0 EFLAGS: 00010093
RAX: 0000000000000000 RBX: ffffc900015b7540 RCX: ffffffff816a6330
RDX: ffff88809d834000 RSI: ffffffff816a635b RDI: 00007f08629809c7
RBP: 00007f08629809c7 R08: ffffc900015b7650 R09: ffffffff8c8d7109
R10: 00007f08629809c7 R11: 0000000000000000 R12: ffffc900015b7650
R13: 0000000000000001 R14: 00007f08629809c7 R15: ffffc900015b7560
 is_kernel include/linux/kallsyms.h:44 [inline]
 is_ksym_addr include/linux/kallsyms.h:50 [inline]
 kallsyms_lookup+0xc3/0x2e0 kernel/kallsyms.c:290
 __sprint_symbol+0x9c/0x1c0 kernel/kallsyms.c:363
 symbol_string+0x14c/0x370 lib/vsprintf.c:969
 pointer+0x185/0x970 lib/vsprintf.c:2226
 vsnprintf+0x5b2/0x14f0 lib/vsprintf.c:2624
 vscnprintf+0x29/0x80 lib/vsprintf.c:2723
 vprintk_store+0x44/0x4a0 kernel/printk/printk.c:1942
 vprintk_emit+0x139/0x770 kernel/printk/printk.c:2003
 vprintk_func+0x8f/0x1a6 kernel/printk/printk_safe.c:393
 printk+0xba/0xed kernel/printk/printk.c:2070
 show_ip+0x22/0x30 arch/x86/kernel/dumpstack.c:131
 show_iret_regs+0x10/0x32 arch/x86/kernel/dumpstack.c:138
 __show_regs+0x18/0x50 arch/x86/kernel/process_64.c:72
 show_trace_log_lvl+0x255/0x2b4 arch/x86/kernel/dumpstack.c:281
 show_regs arch/x86/kernel/dumpstack.c:454 [inline]
 __die_body arch/x86/kernel/dumpstack.c:400 [inline]
 __die+0x51/0x90 arch/x86/kernel/dumpstack.c:414
 no_context+0x56b/0x9f0 arch/x86/mm/fault.c:695
 __bad_area_nosemaphore+0xa9/0x480 arch/x86/mm/fault.c:789
 do_kern_addr_fault+0x5b/0x6f arch/x86/mm/fault.c:1130
 handle_page_fault arch/x86/mm/fault.c:1363 [inline]
 exc_page_fault+0x14c/0x170 arch/x86/mm/fault.c:1418
 asm_exc_page_fault+0x1e/0x30 arch/x86/include/asm/idtentry.h:542
RIP: 0010:__syscall_return_slowpath+0x0/0x280 arch/x86/entry/common.c:332
Code: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 
Lost 40 message(s)!

Crashes (1):
Time Kernel Commit Syzkaller Config Log Report Syz repro C repro VM info Assets (help?) Manager Title
2020/07/27 03:11 upstream 04300d66f0a0 51265195 .config console log report syz ci-upstream-kasan-gce-selinux-root
* Struck through repros no longer work on HEAD.