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bcachefs: Fix possible console lock involved deadlock

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Link: https://lore.kernel.org/all/6822ab02.050a0220.f2294.00cb.GAE@google.com/T/
Reported-by: syzbot+2c3ef91c9523c3d1a25c@syzkaller.appspotmail.com
Signed-off-by: Alan Huang <mmpgouride@gmail.com>
Signed-off-by: Kent Overstreet <kent.overstreet@linux.dev>
This commit is contained in:
Alan Huang 2025-05-20 15:34:28 +08:00 committed by Kent Overstreet
parent 3315113af1
commit 0acb385ec1
6 changed files with 8 additions and 20 deletions
repo.diff.show_diff_stats Download patch file Download diff file Expand all files Collapse all files

1
fs/bcachefs/bcachefs.h
View file

@ -296,7 +296,6 @@ do { \
#define bch2_fmt(_c, fmt) bch2_log_msg(_c, fmt "\n") #define bch2_fmt(_c, fmt) bch2_log_msg(_c, fmt "\n")
void bch2_print_str(struct bch_fs *, const char *, const char *); void bch2_print_str(struct bch_fs *, const char *, const char *);
void bch2_print_str_nonblocking(struct bch_fs *, const char *, const char *);
__printf(2, 3) __printf(2, 3)
void bch2_print_opts(struct bch_opts *, const char *, ...); void bch2_print_opts(struct bch_opts *, const char *, ...);

2
fs/bcachefs/btree_locking.c
View file

@ -213,7 +213,7 @@ static noinline __noreturn void break_cycle_fail(struct lock_graph *g)
prt_newline(&buf); prt_newline(&buf);
} }
bch2_print_str_nonblocking(g->g->trans->c, KERN_ERR, buf.buf); bch2_print_str(g->g->trans->c, KERN_ERR, buf.buf);
printbuf_exit(&buf); printbuf_exit(&buf);
BUG(); BUG();
} }

2
fs/bcachefs/error.c
View file

@ -69,7 +69,7 @@ static bool bch2_fs_trans_inconsistent(struct bch_fs *c, struct btree_trans *tra
if (trans) if (trans)
bch2_trans_updates_to_text(&buf, trans); bch2_trans_updates_to_text(&buf, trans);
bool ret = __bch2_inconsistent_error(c, &buf); bool ret = __bch2_inconsistent_error(c, &buf);
bch2_print_str_nonblocking(c, KERN_ERR, buf.buf); bch2_print_str(c, KERN_ERR, buf.buf);
printbuf_exit(&buf); printbuf_exit(&buf);
return ret; return ret;

11
fs/bcachefs/super.c
View file

@ -104,7 +104,7 @@ const char * const bch2_dev_write_refs[] = {
#undef x #undef x
static void __bch2_print_str(struct bch_fs *c, const char *prefix, static void __bch2_print_str(struct bch_fs *c, const char *prefix,
const char *str, bool nonblocking) const char *str)
{ {
#ifdef __KERNEL__ #ifdef __KERNEL__
struct stdio_redirect *stdio = bch2_fs_stdio_redirect(c); struct stdio_redirect *stdio = bch2_fs_stdio_redirect(c);
@ -114,17 +114,12 @@ static void __bch2_print_str(struct bch_fs *c, const char *prefix,
return; return;
} }
#endif #endif
bch2_print_string_as_lines(KERN_ERR, str, nonblocking); bch2_print_string_as_lines(KERN_ERR, str);
} }
void bch2_print_str(struct bch_fs *c, const char *prefix, const char *str) void bch2_print_str(struct bch_fs *c, const char *prefix, const char *str)
{ {
__bch2_print_str(c, prefix, str, false); __bch2_print_str(c, prefix, str);
}
void bch2_print_str_nonblocking(struct bch_fs *c, const char *prefix, const char *str)
{
__bch2_print_str(c, prefix, str, true);
} }
__printf(2, 0) __printf(2, 0)

10
fs/bcachefs/util.c
View file

@ -262,8 +262,7 @@ static bool string_is_spaces(const char *str)
return true; return true;
} }
void bch2_print_string_as_lines(const char *prefix, const char *lines, void bch2_print_string_as_lines(const char *prefix, const char *lines)
bool nonblocking)
{ {
bool locked = false; bool locked = false;
const char *p; const char *p;
@ -273,12 +272,7 @@ void bch2_print_string_as_lines(const char *prefix, const char *lines,
return; return;
} }
if (!nonblocking) { locked = console_trylock();
console_lock();
locked = true;
} else {
locked = console_trylock();
}
while (*lines) { while (*lines) {
p = strchrnul(lines, '\n'); p = strchrnul(lines, '\n');

2
fs/bcachefs/util.h
View file

@ -214,7 +214,7 @@ u64 bch2_read_flag_list(const char *, const char * const[]);
void bch2_prt_u64_base2_nbits(struct printbuf *, u64, unsigned); void bch2_prt_u64_base2_nbits(struct printbuf *, u64, unsigned);
void bch2_prt_u64_base2(struct printbuf *, u64); void bch2_prt_u64_base2(struct printbuf *, u64);
void bch2_print_string_as_lines(const char *, const char *, bool); void bch2_print_string_as_lines(const char *, const char *);
typedef DARRAY(unsigned long) bch_stacktrace; typedef DARRAY(unsigned long) bch_stacktrace;
int bch2_save_backtrace(bch_stacktrace *stack, struct task_struct *, unsigned, gfp_t); int bch2_save_backtrace(bch_stacktrace *stack, struct task_struct *, unsigned, gfp_t);