syzbot


Internal error in sys_pselect6

Status: upstream: reported C repro on 2025/08/09 00:04
Bug presence: origin:lts-only
[Documentation on labels]
Reported-by: syzbot+21f81a3e6d1c20b4c793@syzkaller.appspotmail.com
First crash: 120d, last: 101d
Fix bisection: failed (error log, bisect log)
  
Bug presence (2)
Date Name Commit Repro Result
2025/08/14 linux-5.15.y (ToT) c79648372d02 C [report] Internal error in sys_pselect6
2025/08/14 upstream (ToT) dfc0f6373094 C Didn't crash
Fix bisection attempts (2)
Created Duration User Patch Repo Result
2025/10/24 19:05 3m fix candidate upstream error job log
2025/10/03 06:14 0m bisect fix linux-5.15.y error job log

Sample crash report:
Internal error: Oops - BTI: 0000000036000001 [#1] PREEMPT SMP
Modules linked in:
CPU: 1 PID: 4309 Comm: syz.1.18 Not tainted 5.15.189-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 06/30/2025
pstate: 42400405 (nZcv daif +PAN -UAO +TCO -DIT -SSBS BTYPE=jc)
pc : get_sigset_argpack fs/select.c:784 [inline]
pc : __do_sys_pselect6 fs/select.c:800 [inline]
pc : __se_sys_pselect6 fs/select.c:794 [inline]
pc : __arm64_sys_pselect6+0x2a0/0x5bc fs/select.c:794
lr : get_sigset_argpack fs/select.c:784 [inline]
lr : __do_sys_pselect6 fs/select.c:800 [inline]
lr : __se_sys_pselect6 fs/select.c:794 [inline]
lr : __arm64_sys_pselect6+0x27c/0x5bc fs/select.c:794
sp : ffff800020787c80
x29: ffff800020787d20
 x28: 00000000fffffff2
 x27: 00000000200004c0

x26: ffff0000d3288024 x25: ffff0000d3288000 x24: 0000000000000000
x23: 0000000000000000
 x22: 1fffe0001a651004
 x21: dfff800000000000

x20: ffff7000040f0f94
 x19: ffff800020787ca0 x18: 0000000000000000
x17: 0000000000000000
 x16: ffff80000892a028 x15: 0000000000000000

x14: 0000000000000000
 x13: 1ffff0000282e06b x12: 0000000000ff0100
x11: 0000000000000000 x10: 00000000200004c0 x9 : 0000ffffffffffff
x8 : 00000000200004c0 x7 : ffff800008750ed4 x6 : 0000000000000000
x5 : 0000000000000000 x4 : 0000000000000001 x3 : 0000000000000001
x2 : 0000000000000008 x1 : 0000000000000001 x0 : 0000000000000000
Call trace:
 get_sigset_argpack fs/select.c:784 [inline]
 __do_sys_pselect6 fs/select.c:800 [inline]
 __se_sys_pselect6 fs/select.c:794 [inline]
 __arm64_sys_pselect6+0x2a0/0x5bc fs/select.c:794
 __invoke_syscall arch/arm64/kernel/syscall.c:38 [inline]
 invoke_syscall+0x98/0x2b8 arch/arm64/kernel/syscall.c:52
 el0_svc_common+0x138/0x258 arch/arm64/kernel/syscall.c:142
 do_el0_svc+0x58/0x14c arch/arm64/kernel/syscall.c:181
 el0_svc+0x78/0x1e0 arch/arm64/kernel/entry-common.c:608
 el0t_64_sync_handler+0xcc/0xe4 arch/arm64/kernel/entry-common.c:626
 el0t_64_sync+0x1a0/0x1a4 arch/arm64/kernel/entry.S:584
Code: d503229f 2a1f03fc 2a1f03e0 f8400958 (2a1c03e1) 
---[ end trace eb859465fdbe5851 ]---
----------------
Code disassembly (best guess):
   0:	d503229f 	csdb
   4:	2a1f03fc 	mov	w28, wzr
   8:	2a1f03e0 	mov	w0, wzr
   c:	f8400958 	ldtr	x24, [x10]
* 10:	2a1c03e1 	mov	w1, w28 <-- trapping instruction

Crashes (18):
Time Kernel Commit Syzkaller Config Log Report Syz repro C repro VM info Assets (help?) Manager Title
2025/08/11 08:55 linux-5.15.y c79648372d02 32a0e5ed .config console log report syz / log C [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan-arm64 Internal error in sys_pselect6
2025/08/27 19:53 linux-5.15.y c79648372d02 e12e5ba4 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan-arm64 Internal error in sys_pselect6
2025/08/27 14:28 linux-5.15.y c79648372d02 e12e5ba4 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan-arm64 Internal error in sys_pselect6
2025/08/26 15:13 linux-5.15.y c79648372d02 bf27483f .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan-arm64 Internal error in sys_pselect6
2025/08/26 15:12 linux-5.15.y c79648372d02 bf27483f .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan-arm64 Internal error in sys_pselect6
2025/08/24 14:35 linux-5.15.y c79648372d02 bf27483f .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan-arm64 Internal error in sys_pselect6
2025/08/23 23:43 linux-5.15.y c79648372d02 bf27483f .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan-arm64 Internal error in sys_pselect6
2025/08/23 23:43 linux-5.15.y c79648372d02 bf27483f .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan-arm64 Internal error in sys_pselect6
2025/08/20 10:53 linux-5.15.y c79648372d02 79512909 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan-arm64 Internal error in sys_pselect6
2025/08/20 10:52 linux-5.15.y c79648372d02 79512909 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan-arm64 Internal error in sys_pselect6
2025/08/20 10:52 linux-5.15.y c79648372d02 79512909 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan-arm64 Internal error in sys_pselect6
2025/08/20 10:52 linux-5.15.y c79648372d02 79512909 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan-arm64 Internal error in sys_pselect6
2025/08/10 06:07 linux-5.15.y c79648372d02 32a0e5ed .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan-arm64 Internal error in sys_pselect6
2025/08/10 06:06 linux-5.15.y c79648372d02 32a0e5ed .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan-arm64 Internal error in sys_pselect6
2025/08/09 11:33 linux-5.15.y c79648372d02 32a0e5ed .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan-arm64 Internal error in sys_pselect6
2025/08/09 06:18 linux-5.15.y c79648372d02 32a0e5ed .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan-arm64 Internal error in sys_pselect6
2025/08/08 17:34 linux-5.15.y c79648372d02 32a0e5ed .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan-arm64 Internal error in sys_pselect6
2025/08/08 17:34 linux-5.15.y c79648372d02 32a0e5ed .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan-arm64 Internal error in sys_pselect6
* Struck through repros no longer work on HEAD.