On 08/25, Andrew Morton wrote: > (cc fsf2 developers) > > On Thu, 25 Aug 2022 08:29:32 -0700 syzbot <syzbot+775a3440817f74fddb8c@xxxxxxxxxxxxxxxxxxxxxxxxx> wrote: > > > Hello, > > > > syzbot found the following issue on: > > > > HEAD commit: a41a877bc12d Merge branch 'for-next/fixes' into for-kernelci > > git tree: git://git.kernel.org/pub/scm/linux/kernel/git/arm64/linux.git for-kernelci > > console output: https://syzkaller.appspot.com/x/log.txt?x=175def47080000 > > kernel config: https://syzkaller.appspot.com/x/.config?x=5cea15779c42821c > > dashboard link: https://syzkaller.appspot.com/bug?extid=775a3440817f74fddb8c > > compiler: Debian clang version 13.0.1-++20220126092033+75e33f71c2da-1~exp1~20220126212112.63, GNU ld (GNU Binutils for Debian) 2.35.2 > > userspace arch: arm64 > > > > Unfortunately, I don't have any reproducer for this issue yet. > > > > IMPORTANT: if you fix the issue, please add the following tag to the commit: > > Reported-by: syzbot+775a3440817f74fddb8c@xxxxxxxxxxxxxxxxxxxxxxxxx > > > > Unable to handle kernel NULL pointer dereference at virtual address 0000000000000000 > > Mem abort info: > > ESR = 0x0000000086000005 > > EC = 0x21: IABT (current EL), IL = 32 bits > > SET = 0, FnV = 0 > > EA = 0, S1PTW = 0 > > FSC = 0x05: level 1 translation fault > > user pgtable: 4k pages, 48-bit VAs, pgdp=00000001249cc000 > > [0000000000000000] pgd=080000012ee65003, p4d=080000012ee65003, pud=0000000000000000 > > Internal error: Oops: 86000005 [#1] PREEMPT SMP > > Modules linked in: > > CPU: 0 PID: 3044 Comm: syz-executor.0 Not tainted 6.0.0-rc2-syzkaller-16455-ga41a877bc12d #0 > > Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 06/20/2022 > > pstate: 80400005 (Nzcv daif +PAN -UAO -TCO -DIT -SSBS BTYPE=--) > > pc : 0x0 > > lr : folio_mark_dirty+0xbc/0x208 mm/page-writeback.c:2748 > > sp : ffff800012803830 > > x29: ffff800012803830 x28: ffff0000d02c8000 x27: 0000000000000009 > > x26: 0000000000000001 x25: 0000000000000a00 x24: 0000000000000080 > > x23: 0000000000000000 x22: ffff0000ef276c00 x21: 05ffc00000000007 > > x20: ffff0000f14b83b8 x19: fffffc00036409c0 x18: fffffffffffffff5 > > x17: ffff80000dd7a698 x16: ffff80000dbb8658 x15: 0000000000000000 > > x14: 0000000000000000 x13: 0000000000000000 x12: 0000000000000000 > > x11: ff808000083e9814 x10: 0000000000000000 x9 : ffff8000083e9814 > > x8 : 0000000000000000 x7 : 0000000000000000 x6 : 0000000000000000 > > x5 : ffff0000d9028000 x4 : ffff0000d5c31000 x3 : ffff0000d9027f80 > > x2 : fffffffffffffff0 x1 : fffffc00036409c0 x0 : ffff0000f14b83b8 > > Call trace: > > 0x0 > > set_page_dirty+0x38/0xbc mm/folio-compat.c:62 2363 void f2fs_update_meta_page(struct f2fs_sb_info *sbi, 2364 void *src, block_t blk_addr) 2365 { 2366 struct page *page = f2fs_grab_meta_page(sbi, blk_addr); --> f2fs_grab_meta_page() gives a locked page by grab_cache_page(). 2367 2368 memcpy(page_address(page), src, PAGE_SIZE); 2369 set_page_dirty(page); 2370 f2fs_put_page(page, 1); 2371 } Is there a change in folio? > > get_next_nat_page+0x198/0x300 fs/f2fs/node.c:154 > > __flush_nat_entry_set fs/f2fs/node.c:3005 [inline] > > f2fs_flush_nat_entries+0x354/0x988 fs/f2fs/node.c:3109 > > f2fs_write_checkpoint+0x350/0x568 fs/f2fs/checkpoint.c:1667 > > f2fs_issue_checkpoint+0x1b0/0x234 > > f2fs_sync_fs+0x8c/0xc8 fs/f2fs/super.c:1651 > > sync_filesystem+0xe0/0x134 fs/sync.c:66 > > generic_shutdown_super+0x38/0x190 fs/super.c:474 > > kill_block_super+0x30/0x78 fs/super.c:1427 > > kill_f2fs_super+0x140/0x184 fs/f2fs/super.c:4544 > > deactivate_locked_super+0x70/0xd4 fs/super.c:332 > > deactivate_super+0xb8/0xbc fs/super.c:363 > > cleanup_mnt+0x1f8/0x234 fs/namespace.c:1186 > > __cleanup_mnt+0x20/0x30 fs/namespace.c:1193 > > task_work_run+0xc4/0x208 kernel/task_work.c:177 > > resume_user_mode_work include/linux/resume_user_mode.h:49 [inline] > > do_notify_resume+0x174/0x1d0 arch/arm64/kernel/signal.c:1127 > > prepare_exit_to_user_mode arch/arm64/kernel/entry-common.c:137 [inline] > > exit_to_user_mode arch/arm64/kernel/entry-common.c:142 [inline] > > el0_svc+0x9c/0x150 arch/arm64/kernel/entry-common.c:625 > > el0t_64_sync_handler+0x84/0xf0 arch/arm64/kernel/entry-common.c:642 > > el0t_64_sync+0x18c/0x190 > > Code: bad PC value > > ---[ end trace 0000000000000000 ]--- > > > > > > --- > > 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@xxxxxxxxxxxxxxxx. > > > > syzbot will keep track of this issue. See: > > https://goo.gl/tpsmEJ#status for how to communicate with syzbot.
