Re: [syzbot] kernel BUG in process_one_work

[syzbot]

Hello,

syzbot has tested the proposed patch but the reproducer is still triggering an issue:
kernel BUG in __tlb_remove_page_size

 exit_mmap+0x205/0x7d0 mm/mmap.c:3047
 __mmput+0x128/0x4c0 kernel/fork.c:1209
 mmput+0x60/0x70 kernel/fork.c:1231
 exit_mm kernel/exit.c:563 [inline]
 do_exit+0x9d7/0x2b60 kernel/exit.c:856
 do_group_exit+0xd4/0x2a0 kernel/exit.c:1019
 __do_sys_exit_group kernel/exit.c:1030 [inline]
 __se_sys_exit_group kernel/exit.c:1028 [inline]
 __x64_sys_exit_group+0x3e/0x50 kernel/exit.c:1028
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x39/0xb0 arch/x86/entry/common.c:80
 entry_SYSCALL_64_after_hwframe+0x63/0xcd
------------[ cut here ]------------
kernel BUG at mm/mmu_gather.c:139!
invalid opcode: 0000 [#1] PREEMPT SMP KASAN
CPU: 0 PID: 5610 Comm: dhcpcd-run-hook Not tainted 6.2.0-rc6-next-20230203-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/12/2023
RIP: 0010:__tlb_remove_page_size+0x24c/0x480 mm/mmu_gather.c:139
Code: 01 00 00 8b 6d 0c e9 e1 fe ff ff e8 ae 63 c1 ff 0f 0b e8 a7 63 c1 ff 4c 89 f7 48 c7 c6 c0 77 58 8a 48 83 e7 fc e8 64 0b fa ff <0f> 0b e8 8d 63 c1 ff 4c 8d 6b 24 48 b8 00 00 00 00 00 fc ff df 4c
RSP: 0018:ffffc9000556f700 EFLAGS: 00010293
RAX: 0000000000000000 RBX: ffffc9000556f9d0 RCX: 0000000000000000
RDX: ffff88802c0a57c0 RSI: ffffffff81c3070c RDI: 0000000000000000
RBP: 0000000000000000 R08: 0000000000000001 R09: ffffffff8e751757
R10: fffffbfff1cea2ea R11: 0000000000000001 R12: 0000000000000000
R13: 0000000000000001 R14: ffffea00009b4f40 R15: ffffc9000556f9f8
FS:  0000000000000000(0000) GS:ffff8880b9800000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 000055b779edb950 CR3: 000000002c188000 CR4: 00000000003506f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 <TASK>
 tlb_remove_page_size include/asm-generic/tlb.h:466 [inline]
 tlb_remove_page+0x12/0x30 include/asm-generic/tlb.h:481
 paravirt_tlb_remove_table arch/x86/include/asm/paravirt.h:92 [inline]
 ___pte_free_tlb+0x123/0x1a0 arch/x86/mm/pgtable.c:57
 __pte_free_tlb arch/x86/include/asm/pgalloc.h:61 [inline]
 free_pte_range mm/memory.c:179 [inline]
 free_pmd_range mm/memory.c:197 [inline]
 free_pud_range mm/memory.c:231 [inline]
 free_p4d_range mm/memory.c:265 [inline]
 free_pgd_range+0x497/0xbf0 mm/memory.c:345
 free_pgtables+0x2d6/0x420 mm/memory.c:386
 exit_mmap+0x1f3/0x7d0 mm/mmap.c:3045
 __mmput+0x128/0x4c0 kernel/fork.c:1209
 mmput+0x60/0x70 kernel/fork.c:1231
 exec_mmap fs/exec.c:1034 [inline]
 begin_new_exec+0xf69/0x2e60 fs/exec.c:1293
 load_elf_binary+0x801/0x4ff0 fs/binfmt_elf.c:1001
 search_binary_handler fs/exec.c:1736 [inline]
 exec_binprm fs/exec.c:1778 [inline]
 bprm_execve fs/exec.c:1853 [inline]
 bprm_execve+0x7fd/0x1b00 fs/exec.c:1809
 do_execveat_common+0x72c/0x8e0 fs/exec.c:1961
 do_execve fs/exec.c:2035 [inline]
 __do_sys_execve fs/exec.c:2111 [inline]
 __se_sys_execve fs/exec.c:2106 [inline]
 __x64_sys_execve+0x93/0xc0 fs/exec.c:2106
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x39/0xb0 arch/x86/entry/common.c:80
 entry_SYSCALL_64_after_hwframe+0x63/0xcd
RIP: 0033:0x7f634f470337
Code: Unable to access opcode bytes at 0x7f634f47030d.
RSP: 002b:00007ffd71eedd08 EFLAGS: 00000246 ORIG_RAX: 000000000000003b
RAX: ffffffffffffffda RBX: 000055b779eecd88 RCX: 00007f634f470337
RDX: 000055b779eecde8 RSI: 000055b779eecd88 RDI: 000055b779eece70
RBP: 000055b779eece70 R08: 000055b779eece75 R09: 0000000000000000
R10: 0000000000000008 R11: 0000000000000246 R12: 000055b779eecde8
R13: 00007f634f615ff4 R14: 000055b779eecde8 R15: 0000000000000000
 </TASK>
Modules linked in:
---[ end trace 0000000000000000 ]---
RIP: 0010:__tlb_remove_page_size+0x24c/0x480 mm/mmu_gather.c:139
Code: 01 00 00 8b 6d 0c e9 e1 fe ff ff e8 ae 63 c1 ff 0f 0b e8 a7 63 c1 ff 4c 89 f7 48 c7 c6 c0 77 58 8a 48 83 e7 fc e8 64 0b fa ff <0f> 0b e8 8d 63 c1 ff 4c 8d 6b 24 48 b8 00 00 00 00 00 fc ff df 4c
RSP: 0018:ffffc9000556f700 EFLAGS: 00010293
RAX: 0000000000000000 RBX: ffffc9000556f9d0 RCX: 0000000000000000
RDX: ffff88802c0a57c0 RSI: ffffffff81c3070c RDI: 0000000000000000
RBP: 0000000000000000 R08: 0000000000000001 R09: ffffffff8e751757
R10: fffffbfff1cea2ea R11: 0000000000000001 R12: 0000000000000000
R13: 0000000000000001 R14: ffffea00009b4f40 R15: ffffc9000556f9f8
FS:  0000000000000000(0000) GS:ffff8880b9800000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f634f47030d CR3: 000000002c188000 CR4: 00000000003506f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400


Tested on:

commit:         4fafd969 Add linux-next specific files for 20230203
git tree:       https://git.kernel.org/pub/scm/linux/kernel/git/next/linux-next.git
console output: https://syzkaller.appspot.com/x/log.txt?x=1107ca0f480000
kernel config:  https://syzkaller.appspot.com/x/.config?x=1d2fba7d42502ca4
dashboard link: https://syzkaller.appspot.com/bug?extid=c0998868487c1f7e05e5
compiler:       gcc (Debian 10.2.1-6) 10.2.1 20210110, GNU ld (GNU Binutils for Debian) 2.35.2
patch:          https://syzkaller.appspot.com/x/patch.diff?x=13d29897480000